MKVToolnix Changelog

What's new in MKVToolnix 83.0.0

Mar 11, 2024

New features and enhancements:
translations: added a Belarusian translation of the programs & the man pages by prydespar (see `AUTHORS`).
mkvmerge, MKVToolNix GUI's chapter editor: added support for reading chapters from ffmpeg metadata files. Implements #3676.
MKVToolNix GUI: added a new action type for execution after jobs or the queue finishes: quitting MKVToolNix. Implements #3677.
Build system changes:
The bundled `fmt` library was updated to v10.2.1.
Other changes:
Tons of changes were made to support the latest development versions of libEBML & libMatroska.

New in MKVToolnix 82.0.0 (Jan 2, 2024)

New features and enhancements:
Mkvmerge: Matroska reader: the "video alpha mode" track header property will be copied to the output file if present. Part of the implementation of #3643.
Mkvmerge: Matroska reader: the "video alpha mode" track header property will be reported in JSON identification mode as the track property `alpha_mode`. Part of the implementation of #3643.
Mkvmerge: Matroska reader: the file's timestamp scaling factor will be reported in JSON identification mode as the container property `timestamp_scale`.
Mkvmerge: MPEG transport stream reader: teletext subtitles intended for hearing impaired people (type 0x05) are now marked as such via the appropriate flag in the track headers.
Mkvmerge: file identification: the JSON identification output schema version has been bumped to 19.
Mkvmerge: added a new hack `always_write_block_add_ids` that can be used as a workaround for players that don't support the handling of missing "Block Addition ID" sub-elements of "Block More" elements in block additions properly. These are used for e.g. alpha channel data in VP9 with a "Block Addition ID" value of 1, which is also its default value. Workaround for the player issues listed in #3643.
Mkvinfo: added support for the "video alpha mode" track header element. Part of the implementation of #3643.
Mkvpropedit, MKVToolNix GUI's header editor: added support for the "video alpha mode" track header property. In `mkvpropedit` it's called`alpha-mode`. Part of the implementation of #3643.
MKVToolNix GUI: multiplexer: when adding files the GUI can automatically enable the "hearing impaired" flag for audio and subtitle tracks if the file name contains the word "cc" or "sdh" delimited by certain characters (configurable). This feature is turned on by default. Implements #3648.
MKVToolNix GUI: multiplexer: when scanning for Blu-ray playlists the GUI will now ignore playlists that are likely meant for menus. Currently the GUI considers this to be the case when a playlist contains the same item at least five times. This behavior can be turned off in the preferences. Implements #3658.
Bug fixes:
Mkvmerge: MPEG transport stream reader: fixed a crash introduced in v81 that occurred when there was at least one PCM track that wasn't copied from the transport stream file. Fixes #3645.
Mkvmerge: when reading data from Matroska files damaged in a specific way, mkvmerge ended up trying to write various types of elements that aren't allowed to be written (so-called `EbmlDummy` elements as well as elements that don't have a value set) to the output file, which caused the underlying `libebml` library to abort. These types of broken elements are now filtered out.
Build system changes:
Qt 5 is no longer supported. Qt 6 is now required for building MKVToolNix. This implies that the options to `configure` revolving around configuring Qt 5 or choosing between the two have been removed (e.g. `--disable-qt6`).
Qt 6 detection: if detection fails, error messages from `qmake` can now be found in `config.log`. See #3649.
Qt 6 detection: `configure` will only consider Qt 6.2.0 or newer, not 6.0.x or 6.1.y anymore, due to the lack of support for the multimedia module.
Qt 6 detection: `configure` will now fail to detect Qt 6 if the 'multimedia' module is not found by `qmake` (e.g. due to development packages not being installed). See #3649.
The bundled `fmt` library was updated to v10.1.1.

New in MKVToolnix 81.0.0 (Dec 2, 2023)

New features and enhancements:
mkvmerge: MPEG transport stream reader: HEVC/H.265: added support for reading single-layer Dolby Vision from Annex B type bitstream read from MPEG transport streams. Partially implements #3113.
mkvmerge: MPEG transport stream reader, HEVC/H.265 elementary stream reader: added support for reading dual-layer Dolby Vision with both the base & enhancement layers in the same track from Annex B type bitstreams in MPEG transport files & elementary stream files. Implements #3126.
mkvmerge: MPEG transport stream reader: HEVC/H.265: implemented combining dual-layer Dolby Vision with base & enhancement layers in different tracks. Implements #3127.
MKVToolNix GUI: multiplexer: added a new option in the preferences for always enabling 'forced' subtitle tracks. A subtitle track is considered to be 'forced' if: the corresponding property is set in the source file; the track's name contains the word 'forced' (in English); deriving the 'forced display' flag from file names is active & the file name matches the corresponding pattern. The option is disabled by default. Implements #3627.
MKVToolNix GUI: multiplexer: the functionality for detecting file name sequences when adding files can now recognize the patterns used by GoPro's cameras for chaptered video files. Implements #3633.
xyzvc_dump: the end position of the current NALU will be output in non-portable format as well.
xyzvc_dump: HEVC: the tool will now also output the inner NALU type of Dolby Vision NALUs (`unspec62` and `unspec63`).
Bug fixes:
mkvmerge: when the user requests processing be stopped after the video ends
mkvmerge` will now take appending files into account properly. It won't stop processing unconditionally after the first file ends anymore. Fixes 3618.
mkvmerge: AV1 handling in readers: the readers will now provide the pixel dimensions to the AV1 packetizer as early as possible, just like for other video packetizers. That way the pixel dimensions are available for calculating the display dimensions when command-line options such as aspect-ratio` & `--aspect-ratio-factor` are used. Before the change the calculation was done based on initial pixel dimension values of 0x0, resulting in display dimensions of 0x0, too. Fixes #3611.
mkvmerge: HEVC/H.265 packetizer: when reading & appending HEVC/H.265 from Matroska, MP4/MOV or FLV files the first frame of all the appended files was sometimes dropped, resulting in broken video at the point where video is appended. Fixes #3479.
mkvmerge: MPEG transport stream reader: when reading MPEG transport streams from Blu-rays the four-byte long `TP_extra_header` structure in front of the transport packets are now skipped properly. Before the fix a stray byte with value of `0x47` inside that `TP_extra_header` structure could have thrown off the detection of where the transport packets start, leading to mkvmerge dropping a few audio and/or video frames at the start of the file. Fixes 3632.
mkvextract: AAC extractor: when an invalid program config element in the GA-specific config element is encountered, the program config element will be disregarded, which avoids mkvextract aborting with an exception. Fixes 3606.
xyzvc_dump: fixed the tool aborting with an exception when the last NALU in an Annex B type file was shorter than four bytes.
Other changes:
AVC & HEVC dumper development tool: the tool has been renamed from xvc_dump` to `xyzvc_dump` as `xvc` is an abbreviation for an existing video codec (Extreme Video Coding), and the tool has nothing to do with that codec.

New in MKVToolnix 80.0.0 (Oct 30, 2023)

New in MKVToolnix 79.0.0 (Aug 20, 2023)

New features and enhancements:
Mkvmerge: AV1: added support for reading Dolby Vision from AV1 IVF & OBU streams. Patches by Quietvoid.
Mkvmerge: MPEG TS reader: added support for colors in teletext subtitles. Patch by Angela Schmid.
MKVToolNix GUI: multiplexer: when adding files the GUI can automatically enable the "forced display" flag for subtitle tracks if the file name contains the word "forced" delimited by certain characters (configurable). This feature is turned on by default.
MKVToolNix GUI: multiplexer: added the option `--stop-after-video-ends` to the dialog for additional command line options.
MKVToolNix GUI: multiplexer: when adding Blu-ray playlists the dialog allowing the user to select the playlist to add will now show audio & video track properties as well (pixel dimensions for video; sampling frequency, channels for audio).
MKVToolNix GUI: header editor: in order to reduce confusion with users non that versed in Matroska elements, the naming of the two "language" track properties has been changed: the old element is now titled "Language (obsolete)" & the current, IETF BCP 47 based one is simply called "Language".
MKVToolNix GUI: preferences: you can now use the "delete" key to remove entries from simple list widgets for strings (e.g. the list of recently used destination directories).
Bug fixes:
Mkvmerge: DTS reader: if a DTS stream doesn't start with a DTS core but a sub-stream element (EXSS), the reader will now look for a core. If found, it'll start processing from there instead of from the start. This fixes the timestamp calculation if the sampling frequency in the core & in the extensions are different.
MKVToolNix GUI: multiplexer: the "emphasis" and "stereoscopy" combo-boxes now have a much smaller minimum width, allowing to make the whole "properties" pane much smaller again. Fixes #3581.
MKVToolNix GUI: macOS: when you install the application from the DMG it'll no longer register itself as an alternate handler for its supported file types. It seems like this overrode existing associations, forcing people to change them manually to whatever they wanted them to be. Additionally this forced the associated file to always be shown with an MKVToolNix icon. The GUI's own `.mtxcfg` files will still be registered. .

New in MKVToolnix 78.0.0 (Jul 2, 2023)

New features and enhancements:
MKVToolNix GUI: header editor: for files that only contain legacy track language elements but no IETF language elements the header editor will now derive the IETF language elements from the legacy elements. See #3557.
AppImage: the AppImage is now built on AlmaLinux 8 with Qt 6.5.1. This means that the minimum glibc version this AppImage is compatible with has also been bumped, to v2.28. The oldest Debian coming with this version is Debian10 "Buster"; for Ubuntu it's 18.10 "Cosmic Cuttlefish".
Windows installer: the installer will now remove the file`dataportable-app` if it's present in the installation directory as its presence would signal to the app to run in portable mode, requiring write access to its base directory. This fixes some installation issues that could occur when a user extracted a portable app archive into a folder like `C:Program FilesMKVToolNix`. Also added an installation check for the same issue. See #3558.
Bug fixes:
all: Linux: if initializing the locale system based on the system's settings fails, e.g. if environment variables such as `LC_ALL` have been set to`fr_FR.UTF-8` but the locale for `fr_FR.UTF-8` hasn't been built, MKVToolNix will try to fall back to `en_US.UTF-8` first & `C.UTF-8` second. If neithe of the three succeeds, an error message will be shown, and the program will abort. This fixes the programs not catching an exception from the `boost::filesystem` library which doesn't cope with mis-configured locale systems well. Workaround for #3574.
mkvmerge: sorting tracks by type did not work properly when some tracks weren't copied. Part of the fix of #3567.
mkvmerge: track numbers in the destination file were assigned out-of-order when the track order in the source files differs from the one in the destination file. Now they're assigned sequentially in the order the tracks appear in the destination file again. Part of the fix of #3567.
MKVToolNix GUI: under certain circumstances the GUI would try to display error messages from a secondary thread, which isn't allowed in Qt, causing to program to either hang or outright crash. Part of the fix of #3556 & #3561.
MKVToolNix GUI: the GUI will check for several potential installation issues wrt. to having write access to certain directories (system's temporary directory, MKVToolNix's file identification cache directory and others) & display proper error messages if not. Part of the fix of #3556 & #3561.
MKVToolNix GUI: header editor: fixed the application crashing whenever you change a property below the "segment information" node. This bug was introduced in v77. Fixes #3556.
MKVToolNix GUI: header editor: when reading files that only contain legacy track language elements but no IETF track language elements, the header editor was showing all tracks as having "English" as the language. This bug was introduced in v77. Fixes #3557.
MKVToolNix GUI: header editor: when a legacy track language element contains a country code (e.g. `fr-CA`), the header editor was wrongfully using `und` = "undetermined" as the language for that element. Now it'll use the language from the language/country pair, which would be `fr` in the earlier example. Part of the fix of #3557.
MKVToolNix GUI: header editor: the keyboard shortcuts from the "modify selected track" sub-menu didn't work right after opening a file. They only started working after opening the "header editor" menu. Fixes #3573.
AppImage: fixed the GUI resources (e.g. icons) not being found.
AppImage: the Qt plugins required for using compose key/dead keys are now included. Fixes #3577.
Build system changes:
The compilation database (`compile_commands.json`) is now always built.The variable `BUILD_COMPILATION_DATABASE` is not evaluated anymore.

New in MKVToolnix 77.0.0 (Jun 5, 2023)

New features and enhancements:
mkvmerge: tracks in the destination file will now be sorted by their type automatically unless the track order is specified with the `--track-order` option. The order is as follows: video tracks first followed by audio & subtitle tracks with other rarely used types of tracks last. Tracks of the same type will be sorted in the same order as their source files occur in the command-line arguments. Note that this doesn't affect file identification. Implements #3545.
MKVToolNix GUI: multiplexer: the default list colors used for distinguishing source files does not include the darkest tier anymore (the ones where one or two components are set to the value 0x3f) as they're hard to distinguish from each other. Only affects new installations, or when the user presses the "reset to default colors" button. Implements #3533.
MKVToolNix GUI: multiplexer: the GUI will now check the state of the 'track enabled' flag of all video, audio & subtitle tracks when starting to multiplex or adding a job to the job queue. If there's no track with its flag turned on for a type, the GUI will turn on the flag for the first track of the type. This behavior can be turned off in the preferences. Implements #3535.
MKVToolNix GUI: header editor: the columns in the tracks/attachments view and the values on the "track type" page will now be updated each time a corresponding property is changed (e.g. when a track's name is changed) instead of showing what's in the file on disk. Implements #3554.
MKVToolNix GUI: macOS: when you install the application from the DMG it'll register itself as an alternate handler for its supported file types. This allows the use of the "Open with" context menu action in Finder.
MKVToolNix GUI: Windows: a new settings in the preferences lets the user chose whether to use the light or the dark color palette, or to follow the system settings. Part of the fix for #3528.
Bug fixes:
Fixed compilation with fmt v10.0.0.
mkvmerge: fixed several instances of wrong format strings for `fmt::format` used in debug messages. Fixes #3548.
mkvmerge: AV1 packetizer: the packetizer did not honor the aspect ratio (factor) given on the command-line via the `--aspect-ratio` or `--aspect-ratio-factor` options.
mkvmerge: JSON identification: cropping parameters are reported again even if some of the four values are not present in the file or set to 0. Fixes #3534.
mkvmerge: Windows: when writing to a network share connected via SMB1`mkvmerge` was aborting with a error about `create_directory() failed` with existing directories. This was due to a bug in recent versions of the Boost.Filesystem library. The Windows version of MKVToolNix will be built with Boost 1.82.0 from now on which includes the fix. Fixes #3547.
MKVToolNix GUI: the defunct "disable the dark mode" checkbox was removed from the preferences.
MKVToolNix GUI: language dialog: under certain conditions the controls for the individual components remained disabled when the dialog is opened even though editing of individual components is selected. Part of the fix of #3532.
MKVToolNix GUI: language dialog: the controls for the individual components weren't re-initialized properly after opening the dialog for the second & all following times, potentially leaving previously selected/entered entries intact, primarily when editing multiple tracks at once. Part of the fix of #3532.
MKVToolNix GUI: header editor: using the actions from the "modify selected track" context menu only worked if the user right-clicked on the first column in the view. They now work for clicks on any of the columns. See also #3554.
MKVToolNix GUI: header editor: some of the actions toggling specific flags from the "modify selected track" did not work correctly if the flag wasn't currently present in the file, especially if the underlying value has a default value in the Matroska specs.
MKVToolNix GUI: Windows: the GUI will now always use its own implementation of light & dark palettes instead of relying on Qt. This circumvents two issues with the palette support in Qt 6.5.0:
if Windows 11's dark application mode is active, links were displayed in a hard-to-read dark blue.
for unknown reasons the the dark palette was not chosen on some Windows 11 installations even though Windows 11's color mode was set to "dark".This is a workaround for #3528.
Build system changes:
The bundled `fmt` library was updated to v10.0.0.
MKVToolNix GUI now uses an external Qt resource file instead of compiling it into the executable. The resource file has reached a size at which the C++ compiler exhausts available virtual memory on some 32-bit architectures. On Windows & macOS the GUI will look for the file in `<folder_with_executables>/data/qt_resources.rcc`, and in the directory set with `configure`'s `--datadir` parameter on other systems (which usually means `/usr/share/mkvtoolnix`). The `install` build system commands installs it into that folder.

New in MKVToolnix 76.0.0 (Apr 30, 2023)

Important notes:
mkvmerge: removed the option `--blockadd`. Removing block additional data is not possible anymore, as it is often required for proper decoding. Part of the implementation of #3511.
New features and enhancements:
mkvmerge: JSON file identification: added a child element called`num_index_entries` to the `properties` track element containing the number of index entries found for a track. Currently only implemented for Matroska files where it contains the number of cue points. See #3510.
mkvmerge: the maximum block addition ID track header value is now calculated automatically from both the existing mappings & the actually used block additions in the block groups. Part of the implementation of #3511.
mkvmerge: Matroska reader: when reading WebM files that use block additions with ID 4 (HDR for VP9) an appropriate block addition mapping will be created automatically. Part of the implementation of #3511.
mkvmerge: MP4 reader: the title/movie name meta data (content of the`udta.meta.ilst.©nam` atom) will now be copied over as the segment title track header attribute. Part of the implementation of #3475.
mkvmerge: MP4 reader: the comment & encoder meta data (content of the`udta.meta.ilst.©cmt` & `….©too` atoms) will now be copied over as global tags `COMMENT` & `ENCODER` respectively. Part of the implementation of#3475.
mkvmerge, MKVToolNix GUI's multiplexer: added an option to stop processing after the primary video track ends called `--stop-after-video-ends`. This discards any remaining packets of other tracks. Part of the implementation #3506.
MKVToolNix GUI: only on Windows: the GUI now uses Qt's "Fusion" style instead of the deprecated "Windows Vista" style. The advantage is that as of Qt 6.5 the "Fusion" style properly supports Windows 10's & 11's dark application mode. The Windows binaries are now built with said Qt version. Therefore the option to disable the dark mode has been removed. Fixes #3264 and likely others.
MKVToolNix GUI: multiplexer: automatically setting the destination file name: added an option in the preferences for using the first source file's directory name instead of its file name as the basis for the destination file name. Implements #3512.
MKVToolNix GUI: multiplexer: double-clicking on certain columns in the "tracks" view will now toggle them directly (columns "Default track" & "Forced track") or activate the corresponding control (columns "Language", "Name" & "Delay"). Double-clicks on other columns will do what they've done before, too: toggling the "Copy item" state. Implements #3513 & others.
MKVToolNix GUI: the dialog for editing language tags is now created only the first time the user wants to edit a language tag & cached afterwards instead of creating a new instance each time. This makes subsequent uses instant.
Bug fixes:
mkvmerge: mkvmerge will now only try to probe for VobSubs if the name of the file to identify ends in either `.idx` or `.sub`, preventing mis-identification of other file types if VobSubs with the same base name exist in the same directory. Fixes #3508.
mkvmerge: AC-3: mkvmerge will now skip certain types of garbage data (16 bytes starting with 0x01 0x10) that can occur before each sync frame, fixing the file not being identified as AC-3. Fixes #3484.
mkvmerge: Matroska reader: when reading files that use block additions with IDs other than 1 (e.g. 4 for HDR for VP9) the IDs will now be kept & written to the output file. Before no ID would be written, effectively using 1 as that's the default value for the corresponding element. Part of the implementation of #3511.
mkvmerge: mkvmerge will no longer write block addition mappings or the max block addition ID track header elements when creating a WebM file as those elements aren't supported there. Part of the implementation of #3511.
mkvpropedit: fixed replacing chapters & tags in files that don't contain tracks. Fixes #3498.

New in MKVToolnix 75.0.0 (Mar 26, 2023)

New in MKVToolnix 74.0.0 (Feb 12, 2023)

New features and enhancements:
Mkvmerge: SRT handling: added a hack called `--engage keep_whitespaces_in_text_subtitles` which disables stripping whitespaces from the start & end of each line of SRT entries during muxing. Part of the implementation of #3470.
Bug fixes:
All: Windows: UNC paths of type `\?C:…` are supported again by switching back to Boost's file system library instead of using C++17's file system library. Fixes #3058.
Mkvmerge: AVC/H.264 & HEVC/H.265 packetizers: when appending tracks the pixel dimensions will be checked & muxing will be aborted if they don't match. Fixes #3480.
Mkvmerge: file type detection: file types that can be detected unambiguously by their content (e.g. Matroska, MP4, WAV…) will now preferred in the detection order over file types based on their extension. Prevents certain cases of mis-detection, e.g. DTS in WAV but with a file name extension of `.dts` being detected as the wrong type of DTS. Fixes #3462.
mkvmerge: SRT handling: whitespaces will now be stripped from the start & the end of each line of each entry, not just from the end of the last line. Part of the fix of #3470.
Mkvextract: SRT extraction: whitespaces will not be stripped from the start & end of the whole entry anymore. Part of the fix of #3470.
MKVToolNix GUI: multiplexer: when adding multiple files that include certain file types (chapters, segment info and tag files) and when the choice where to add them is "all files to a single new tab", these certain file types will now be added in the newly added tab as well instead of the current tab that had already been open. Fixes #3469.
Build system: fixed compatibility with Ruby 3.2.0 by using `FileTest.exist?`instead of `File.exists?`, `Dir.exists?` & `FileTest.exists?` which were removed in that release.
Build system changes:
MKVToolNix is now using & requiring Boost's "file system" and "system" libraries again instead of C++17's file system library. This is due to gcc's library not supporting UNC paths of types `\?C:dirfile.ext`.

New in MKVToolnix 73.0.0 (Jan 2, 2023)

New in MKVToolnix 72.0.0 (Nov 14, 2022)

New features and enhancements:
mkvmerge: AV1 parser: the variable-width OBU size field will be re-written with minimal length if it's encoded longer than necessary.
mkvmerge: when splitting is active the program will output the timestamps actually used for making the decision when to split. If GUI mode is active, a specially formatted line `#GUI#splitting_before_timestamp <timestamp>` is output as well. Lines prefixed with`#GUI#` are suitable for machine parsing, won't be translated and are guaranteed not to change in format. Implement #3421.
MKVToolNix GUI: multiplexer: when dragging & dropping directories to the "attachments" tab, the files contained in those directories will be attached. Implements #3410.
MKVToolNix GUI: info tool: added information about the file (directory, size, modification timestamp) at the top of each tab. Implements #3407.
Bug fixes:
mkvmerge: AV1 parser: fixed the parser completely aborting when parsing the OBU size field fails due to there not being enough data to parse. Instead the parser will remember the last known-good position & restart from there after more data is available. Fixes #3431.
mkvmerge: HDMV PGS subtitles: reverted the change that implemented a heuristic for detecting bogus timestamps & attempting to fix them. This was done to fix #3268. Unfortunately this affected valid subtitle files with intentional huge gaps in timestamps, e.g. forced subtitle tracks. The heuristic has simply been removed, fixing #3392.
mkvmerge: Matroska reader: fixed reading files with EBML Void elements before the Matroska Segment element.
mkvmerge: fixed reversed attachment selection: `--attachments !4` would not copy any attachment instead of all attachments but the one with ID 4. Fixes #3427.
mkvextract: IETF BCP 47/RFC 5646 language tags: mkvextract will now use prefer IETF BCP 47 track language elements if they're present. Only affects the VobSub & USF subtitle extraction.
mkvpropedit, MKVToolNix GUI's chapter & header editors: updated the list of deprecated Matroska elements. The applications will no longer try to write those elements, even if they're found in the file to be modified. Th programs will no longer abort with error messages such as `assertion "false" failed`. Fixes #3416.
mkvpropedit, MKVToolNix GUI's chapter & header editors: when the Matroska version numbers stored in the EBML Head element are updated, the updated EBML Head element might be smaller than the existing one. In that case the programs used to shrink the EBML Head & write a small EBML Void element between the updated EBML Head & the following element, usually a Matrosk Segment element. This isn't widely supported by programs includin MKVToolNix itself, causing them to declare such files as invalid. The programs will now create the EBML Void element inside the EBML Head element, making them a level 1 element instead of a level 0 element. Fixes #3355.
mkvpropedit, MKVToolNix GUI's chapter & header editors: often the programs have to relocate the Master elements in which the modifications were done. In that case the Seek Head elements must also be updated to reflect to the Master elements' new positions. If a file contained a Seek Head element at the start already and if that Seek Head was too small to contain the updated positions, the programs would end up in an endless loop trying to write data to the end, creating ever-growing files. This is now handled properly by voiding this too-small Seek Head & finding a proper space for a new one instead. Fixes #3338.
MKVToolNix GUI: header editor: fixed pixelated icons on higher display scaling values. Fixes #3420.
Build system changes:
bug fix: libFLAC detection is now done via `pkg-config`, and the corresponding compiler flags are honored. Fixes static compilation with newer versions of libFLAC with MXE where a compiler definition is required to signal that it libFLAC wasn't built as a DLL.

New in MKVToolnix 71.1.0 (Oct 9, 2022)

New in MKVToolnix 71.0.0 (Oct 9, 2022)

New in MKVToolnix 70.0.0 (Aug 14, 2022)

New in MKVToolnix 69.0.0 (Jul 10, 2022)

Important notes:
all: the spelling of "colour" was changed to "color" throughout all programs to match the use of American English spelling in MKVToolNix. This not only affects documentation and user interface controls, but also program options for mkvmerge & mkvpropedit. Both programs will continue to accept the British English spelling of their respective options indefinitely. One breaking change is that the property names in mkvmerge's JSON identification mode have also been changed to American English spelling. As those properties have only been introduced in release v68, this seems like a small enough window to make such a change.
New features and enhancements:
MKVToolNix GUI: the number of recently used entries (e.g. destination directories) remembered by the GUI can now be configured in the preferences. Implements #3362.
MKVToolNix GUI: multiplexer: when adding files the track properties regarding color information & color mastering meta information will be parsed & set in the corresponding GUI controls. Implements #3359.
MKVToolNix GUI: job queue: the job queue can now be sorted by clicking on the column headers. Part of the implementation of #3365.
MKVToolNix GUI: job queue: when loading jobs from the queue directory that weren't previously known to the program those jobs will be sorted by their "date added" timestamp instead of using the order the operating system returns them in. Part of the implementation of #3365.
Bug fixes:
build system: fixed compilation with fmt v9. Fixes #3366.
mkvmerge: HEVC ES parser: the parser will now parse at least the first full access unit before reporting that it has found all the required headers. Otherwise parsing might stop in the middle of the access unit due to the source reader not providing more data in the first call, leading to the parser not finding the `unspec62` and `unspec63` NALUs required for Dolby Vision. Fixes #3363.
MKVToolNix GUI: preferences: the default actions added to the "execute programs" section on new installations now default to use WebM file names instead of Ogg, matching the format of the included audio files.
Build system changes:
The bundled `fmt` library was updated to v9.0.0.

New in MKVToolnix 68.0.0 (May 23, 2022)

New in MKVToolnix 67.0.0 (Apr 10, 2022)

New features and enhancements:
all: IETF BCP 47/RFC 5646 language tags: when deriving the legacy language element codes to use a language tag's ISO 639 code is also potentially interpreted as an & its prefix is used as the legacy language code. For example, "Yue Chinese" = `yue` is not part of ISO 639-2. However, there is an extlang subtag `yue` with a valid prefix of `zh` ("Chinese"), and for "Chinese" there is an ISO 639-2 language code: `chi`. In this example the IETF language element would be set to `yue` and the corresponding legacy element to `chi`. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: grandfathered language tags are now supported. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: all deprecated subtags from theIANA language subtag registry are now supported. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: all lists of valid subtags have been updated from their respective authoritative sources. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: all in the IANA language subtag registry are now supported, even those marked as deprecated and of type 'grandfathered'. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: reduced the maximum number of extended language subtags that are present in a valid tag from 3 to 1 in compliance with RFC 5646 section 2.2.2. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: all language codes reserved for private/local use (`qaa`–`qtz`) are now supported. Part of the implementation of #3307.
all: IETF BCP 47/RFC 5646 language tags: Digital Cinema Naming Convention language codes that fall into the IETF BCP 47 range of "private use" tags (`qaa`–`qtz`) are now replaced by their IETF BCP 47 equivalents during normalization (e.g. `QMS` ? `cmn-Hans`). Part of the implementation of #3307.
all: added a new translation to Chinese Simplified (Singapore) by Dian Li.
mkvmerge, mkvpropedit: added a new command line option called `--enable-legacy-font-mime-types`. With this option on the two programs will use the same legacy MIME types for fonts whenever new attachments are added (both programs), when reading existing attachments (only `mkvmerge`) or when replacing existing ones (only `mkvpropedit`).
mkvmerge, mkvpropedit: IETF BCP 47/RFC 5646 language tags: added a command line option `--normalize-language-ietf <mode>` which turns on normalization of IETF BCP 47 language tags to either their canonical (mode `canonical`) or extended language subtags form (mode `extlang`) or turns it off (mode `off`). If the option isn't given, language tags will now be normalized to the canonical form. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: ISO 639-3 and 639-5 languages will now be used by default. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: the language editor dialog will now show warnings in several cases: when deprecated tags are used; when the tag's canonical and/or extlang forms differ from the user input. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: the language editor now has a button to replace the current tag with a normalized form (canonical or extlang) if those differ from the current tag. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: added an option in the preferences to always normalize all language tags to their canonical or extlang forms or to turn normalization off. Can also be enabled from the language editor dialog. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: the language dialog now shows a warning if a variant is used with a prefix that isn't in the variant's list of suitable prefixes. It'll also say if the corresponding canonical/extlang forms would have a suitable prefix. Part of the implementation of #3307.
MKVToolNix GUI: IETF BCP 47/RFC 5646 language tags: the language dialog now shows a warning if a script is used with a language for which it should be suppressed. Part of the implementation of #3307.
MKVToolNix GUI: multiplexer: the track property group boxes in the scrollable pane are now collapsible & expandable, saving their state over restarts of the GUI. This is in preparation of adding many more track properties in future releases, allowing the user to hide parts they don't use all that often.
MKVToolNix GUI: multiplexer: if the option "use legacy font MIME types" is enabled in the preferences, the new command line option `--enable-legacy-font-mime-types` will be passed to `mkvmerge` in order to have it remap the MIME types of existing attachments, too.
Bug fixes:
all: IETF BCP 47/RFC 5646 language tags: variants aren't validated wrt. to prefixes anymore as BCP 47 doesn't actually pose restrictions on them, saying only that prefixes "are suitable sequences" for use with the variants. What is now verified, though, is that no variant is used multiple times within the same language tag. Part of the implementation/fix of #3307.
build system & MKVToolNix GUI: fixed detecting the presence of & the compilation with the multimedia module of Qt version 6.2.0 and newer.
build system: fixed compilation on Unices other than Linux & macOS (e.g. FreeBSD). Fixes #3316.
MKVToolNix GUI: job queue: fixed compiling in the audio player code for the the "play audio" end-of-job action. Fixes #3303.
MKVToolNix GUI: multiplexer: recognizing added XML chapter, segment info or chapter files required the XML declaration & root node (e.g. `<?xml…?> … <Chapters>` for chapters) be located within the first 1 KB, which wasn't enough for files that contain a lot of comments at the start like the included `example-chapters-2.xml`. The detection range was extended to 10 KB. Fixes #3302.
Build system changes:
build system: the provided Windows binaries are now compiled with Qt 6. A drawback is that certain audio formats aren't supported anymore by Qt for the "end of job" sound notification playback, notably the Ogg file format & the Vorbis audio codec. MKVToolNix therefore now ships Opus-in-WebM files for the same purpose.
The bundled `fmt` library was updated to v8.1.1.
The bundled `nlohmann-json` library was updated to v3.10.5.
The bundled `pugixml` library was updated to v1.12.1.

New in MKVToolnix 66.0.0 (Mar 13, 2022)

New in MKVToolnix 65.0.0 (Feb 6, 2022)

New features and enhancements:
mkvmerge: the options `--default-track` and `--forced-track` have been renamed to `--default-track-flag` and `--forced-display-flag` respectivelyfor improved consistency with other option names & the wording used in the GUI. However, the old names will be supported and recognized indefinitely. What will remain unchanged is the property names for those flags in mkvmerge's identification output. Existing third-party programs will continue working as they are.
mkvmerge: added a new option `--track-enabled-flag` to set or unset the "track enabled" track header flag.
mkvmerge: MP4 reader: `mkvmerge` will now evaluate the `flags` field of the track header atom (`tkhd`) and set the track's "enabled" flagaccordingly. Implements #3272.
MKVToolNix GUI: multiplexer: added support for the "track enabled" track header flag.
MKVToolNix GUI: multiplexer, header editor: added several menu entries & keyboard shortcuts for toggling various track flags of the currently selected tracks, e.g. `Ctrl+Alt+F, D` (that's `Ctrl` and `Alt` with `F` simultaneously followed by `D` without any other key pressed) for toggling the "default track" flag. Part of the implementation of #3253.
MKVToolNix GUI: multiplexer, header editor: added menu entries & keyboard shortcuts for setting the language of the currently selected tracks to one from a configurable list of languages. The shortcuts used are `Ctrl+Alt+A, 1` through `Ctrl+Alt+A, 0` for the first ten entries of that list (that's`Ctrl` and `Alt` with `A` simultaneously followed by a digit without anyother key pressed). Part of the implementation of #3253.
MKVToolNix GUI: chapter editor: if the user enters commas in start or endtimestamps they will automatically be changed to points as the decimal separator, allowing for easier copy & paste from other programs/sources. Implements #3273.
MKVToolNix: header editor: the selected track or attached file can now be moved up & down with the keyboard shortcuts `Ctrl+Up` & `Ctrl+Down` respectively. Part of the implementation of #3253.
Bug fixes:
mkvmerge: Matroska reader: DVB subtitle tracks with a codec private data size of more than five bytes are accepted now, too. Fixes #3258.

New in MKVToolnix 64.0.0 (Dec 27, 2021)

New in MKVToolnix 63.0.0 (Nov 14, 2021)

New in MKVToolnix 62.0.0 (Oct 10, 2021)

New features and enhancements:
All: IETF BCP 47/TFC 5646 language tags: all ISO 639 languages are now available, even the ones that aren't of types "Constructed", "Living" or "Special".
Mkvmerge, mkvpropedit: chapters: both programs will now write elements set to their default value, too (e.g. the legacy language element if it's set to `eng`). This is done to be more consistent with how MKVToolNix GUI writes chapters. Implements #3210.
MKVToolNix GUI: multiplexer: when adding new files as attachments the GUI checks if there are other attachments with the same name. If so, the GUI would ask whether to skip the affected files or add them anyway. There's now an option in the preferences to always skip such files, and it's enabled by default.
MKVToolNix GUI: chapter editor: removed the support for explicitly setting the legacy country elements. Instead the legacy country elements are derived from the region parts of the IETF BCP 47 languages. Part of the implementation of.
Bug fixes:
Mkvmerge: fixed a crash when splitting by chapters is enabled but there are no chapters at all. Part of the fix of #3198.
Mkvmerge: the error message when trying to split by a chapter number that doesn't exist contained the wrong number of chapters that actually do exist.
Mkvmerge: AVC ES parser: fixed mkvmerge aborting due to uncaught exception when encountering bad SPS data.
Mkvmerge: AVC/H.264 parser: re-added the hack `--engage all_i_slices_are_key_frames` which was accidentally removed in release v61.
Mkvmerge: AVI reader: fixed a crash trying to allocate too big of a memory chunk due to an integer overflows in check conditions.
Mkvmerge: HEVC ES parser: fixed another issue with frame type recognition. Certain frames were marked as B frames/discardable on the container level even though they could be reference pictures. Now only SLNR pictures (sub-layer non-reference) are marked that way.
Mkvmerge: HEVC ES reader: improved file content detection for HEVC ES files with wrong file name extensions (e.g. `.mkv`), which fixes them being mis-detected as something else, e.g. DTS.
Mkvmerge: HEVC ES parser: "end of sequence" NALUs are kept now, and no superfluous flushing will be done when one is found. This prevents splitting NALUs into two different Matroska blocks when they should really be part of a single one, also causing problems with erroneous timestamps. Mostly affects DoVi NALUs.
Mkvmerge: Matroska reader, TrueHD: mkvmerge will now probe much more TrueHD frames trying to find the first sync frame. This fixes track detection in situations when a TrueHD doesn't start with a sync frame, e.g. when the source file's the result of splitting between sync frames.
Mkvmerge, MKVToolNix GUI's chapter editor: IETF BCP 47/RFC 5646 language tags: when reading chapters from MPLS playlist files, the `ChapLanguageIETF` element will now be set to the configured default chapter language, not just the legacy `ChapterLanguage` element.
Mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: IETF BCP 47 elements will now always be created before writing chapters unless IETF BCP 47 elements are disabled.
Mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: when a chapter display element contains legacy language & country elements but no IETF BCP 47 elements and IETF BCP 47 elements aren't disabled, the IETF BCP 47 elements created will contain the region from the legacy element.
Mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: Legacy country elements are now created when IETF BCP 47 elements are present & contain a region code allowed in legacy country elements.
Build system changes:
The `tools` sub-directory is now always built. The corresponding `configure` option `--with-tools` has been removed. The `install` target still doesn't install them, though.

New in MKVToolnix 61.0.0 (Aug 30, 2021)

New features and enhancements:
all: IETF BCP 47/RFC 5646 language tags: implemented support for officially registered IANA language tag extensions.
mkvmerge: track selection: when using language tags for selecting which tracks to keep, mkvmerge will now use component-based language tag matching instead of comparing them verbatim. This means that only those components language, region etc.) the user specified will be required to exist and be equal. For example, if a file contains three subtitle tracks with languages es` (generic Spanish), `es-MX` (Spanish as spoken in Mexico) and `es-ES` Spanish as spoken in Spain), the user can use `--stracks es` to match all three tracks or be more specific with e.g. `--stracks es-MX` which would only match one track. Similarly inverting the selection with e.g. `--stracks es` would get rid of all three tracks, not just the one for the generic Spanish.
MKVToolNix GUI: multiplexer: deriving track languages from file names: the GUI can now detect full BCP 47/RFC 5646 language tags in file names. Part of the implementation of #3173.
MKVToolNix GUI: multiplexer: deriving track languages from file names: the default list of boundary characters now includes `-`. Part of the implementation of #3173.
MKVToolNix GUI: multiplexer: the GUI now defaults to the "lower" process priority setting for new installations in order to leave more room for other applications, especially interactive ones. Up to and including v59 the default was the "normal" process priority. v60 changed that to "lowest", which turned out to be much slower on Windows for no real gain over "lower". The setting will be auto-corrected by the GUI if the settings file were saved last with a version between v60.0.0.0 & v60.0.0.17 & "lowest" & it is still set to "lowest".
HEVC dumper development tool: the tool has been renamed to `xvc_dump` and extended to be able to dump AVC/H.264 bitstreams, too. It now also detects the type of bitstream framing (ISO 14496-15 vs. ITU-T H.264/H.265 Annex B).
Bug fixes:
all: IETF BCP 47/RFC 5646 language tags: fixed a corner case of wrongfully allowing scripts/variants not listed in any of the entries in the prefix list when the prefix list contains prefixes restricting scripts/variants and a prefix solely with the language at the same time (example: the variant ekavsk` with its prefixes `sr`, `sr-Cyrl` and `sr-Latn` where
e.g. `sr-ekavsk` and `sr-Cyrl-ekavsk` should be allowed but not sr-Bali-ekavsk`).
mkvmerge: HEVC/H.265: the frame type of B frames was often wrongfully signalled as P frames instead, both with `BlockGroup` (missing second references) and `SimpleBlock` ("discardable" flag not set) elements.
mkvmerge: SSA/ASS packetizer: the frame numbers will now be re-calculated when appending SSA/ASS tracks so that frame numbers of appended tracks are always strictly higher than frame numbers of the track they're appended to.
mkvmerge, MKVToolNix GUI's chapter editor: BCP 47/RFC 5646 language tags: when BCP 47 language tags are used with a language code that isn't part ofISO 639-2, the programs will now write a legacy language element set to und` ("undetermined") instead of not writing such an element at all or writing one with an invalid code. Fixes #3174.
mkvmerge, MKVToolNix GUI's chapter editor: BCP 47/RFC 5646 language tags: the programs will ensure that the legacy and IETF language elements writte will be unique within the scope of the same "chapter display" element.
mkvinfo, MKVToolNix GUI's info tool: in summary mode the frame type was reported wrong for `BlockGroup` elements in which the `ReferenceBlock` elements were located behind the `Block` element.
Build system changes:
all: `std::codecvt_utf8` is now used instead of Boost's utf8_codecvt_facet`. The bundled copy the latter in `lib/boost` ha therefore been removed.

New in MKVToolnix 60.0.0 (Jul 31, 2021)

New features and enhancements:
all: IETF BCP 47/RFC 5646 language tags: added support for language families from ISO 639-5 that aren't part of 639-2.
all: IETF BCP 47/RFC 5646 language tags: implemented support for Alpha 2 country codes of the "user-defined" category: `AA`, `QM`–`QZ`, `XA`–`XZ` and `ZZ`.
all: IETF BCP 47/RFC 5646 language tags: updated the various lists of valid subtags from the official specs.
MKVToolNix GUI: multiplexer: pressing the keyboard shortcut for the track's anguage" label (Alt+L for English) will now open the language dialog.
MKVToolNix GUI: multiplexer: added an option in the preferences for turning off the colored boxes indicating which file each track belongs to.
BUG FIXES:
all: IETF BCP 47/RFC 5646 language tags: fixed validating extended language & variant subtags against their allowed prefixes (e.g. a valid tag with a country code as in `de-CH-1996` is recognized as valid while two generally known variants that aren't allowed together as in `de-1901-1996` is recognized as invalid).
all: IETF BCP 47/RFC 5646 language tags: when looking up a language for a two- or three-letter code, the programs will no longer compare that code with language names as that was unintended, ambiguous (e.g. the code "Ga" could be interpreted as the 639-2 alpha-2 code for "Irish" or as the name of the language called "Ga") and only worked with languages whose name was at most three letters long.
mkvmerge: HEVC/H.265: appending Matroska files with HEVC tracks might lead to the loss of the first couple of frames from each of the second and all following files. Fixes #3170.
mkvmerge, mkvextract: HEVC/H.265 parser: fixed the programs aborting when parsing VPS or SPS NALUs with invalid content due to unhandled exceptions. Fixes #3162.
MKVToolNix GUI: multiplexer: when the option "use legacy MIME types for font attachments" is enabled, the GUI will now use `application/x-truetype-font` for font collection files.
MKVToolNix GUI: multiplexer: fixed escaping the `mkvmerge` argument in the "Show command-line options" dialog for the "Windows (cmd.exe)" mode. Fixes #3164.
MKVToolNix GUI: multiplexer: when adding multiple files at once, the GUI will sort file names with numbers the way a human would expect it to. For example, `1.mp4`, `9.aac`, `10.srt`, `11.srt` are now sorted exactly that order instead of `1.mp4`, `10.srt`, `11.srt`, `9.aac`.
MKVToolNix GUI: header editor: the header editor will now honor the "use legacy MIME types when adding font attachments" setting when adding new attachments.

New in MKVToolnix 59.0.0 (Jul 10, 2021)

New features and enhancements:
Mkvmerge: WebVTT parser: the parser now follows the specs' rules for parsing timestamps more closely by being more lenient: it allows arbitrary number of spaces & tabs at the start of the line & around the arrow; it allows any number of digits for the hours. Part of #3139.
MKVToolNix GUI: multiplexer: when adding a Blu-ray playlist without scanning for other playlists the GUI will now look for disc library information & let the user select which one to use if there's more than one entry. Implements #3143.
MKVToolNix GUI: multiplexer: added an option for sorting files & tracks by
track types when adding them to multiplex settings. The order is: video
first followed by audio, subtitles and other types. Files & tracks can still
be reordered manually later. The option is enabled by default & can be found
in the preferences → "Multiplexer" page → "Adding files" section. Implements #2366.
MKVToolNix GUI: multiplexer: added an option for recognizing file name
sequences such as `movie.001.mp4`, `movie.002.mp4`, `movie.003.mp4` when adding multiple files at once. If a sequence is detected, the only first file will be added while the second and following file names will be appended to the first one. The option is enabled by default & can be found in the preferences → "Multiplexer" page → "Adding files" section. Implements #2866.
MKVToolNix GUI: multiplexer: added small colored boxes for each file & track in order to indicate from which file each track is read. The colors used can be configured in the preferences → "Multiplexer" page → "File & track
colors" section.
Bug fixes:
Build system: fixed compilation with fmt v8. Fixes #3151.
Mkvmerge: SRT subtitle reader: characters that aren't valid according to the assumed encoding of the file will now be replaced by the Unicode
"Replacement Character" U+FFFD instead of keeping the invalid characters, potentially violating the Matroska specs.
Mkvmerge: WebVTT parser: the parser now accepts timestamps with hours
larger than 99. Part of #3139.
Mkvextract: TTA extraction, only on Windows: fixed removing the temporary file created during extraction.
Mkvmerge, mkvpropedit, MKVToolNix GUI's multiplexer & header editor: MIME type detection is now done using Qt instead of the `magic` library. The main impact is the MIME types of TrueType & OpenType fonts are now detected correctly. Fixes #3137.
Mkvmerge, mkvinfo, MKVToolNix GUI's info tool: only on Windows: displaying dates before 1970-01-01 00:00:00 UTC or after 2038-01-19 03:14:08 UTC was broken. Note that the header editor was not affected. Fixes #3148.
MKVToolNix GUI: only on 64-bit Windows: under certain conditions, the 64-bit Windows binaries crashed when opening dialog windows. Even though the underlying bug hasn't been identified, the investigation showed that building it with newer versions than 10.2.0 of the mingw/gcc cross-compiler enabled the crashes, while binaries built with 10.2.0 were fine. This affected v57 and v58 which were built with gcc versions 10.3.0 and 11.1.0 respectively. For the time being I've switched back to building Windows binaries with gcc 10.2.0. Fixes #3132 & #3133.
MKVToolNix GUI: multiplexer: when adding files to the multiplexer by running the GUI's executable with file names as command line arguments, the source directory will be remembered as the "last open directory" again, causing subsequent uses of the "open file" dialog to start in the same directory.
MKVToolNix GUI: multiplexer: the "default track flag" column in the track
list was missing its icons. Additionally it contained text even for things
that aren't regular tracks and therefore do not actually have that flag
(e.g. chapters or tags). Fixes #3144.
MKVToolNix GUI: multiplexer: the default for the dialog asking the user what to do with dragged & dropped files if they've never seen the dialog is back to adding the files to the current multiplex settings instead of "add as additional parts" which was an unintentional default.
MKVToolNix GUI: multiplexer: the "show command line" dialog will now always use backward slashes for the "Windows (cmd.exe)" mode and forward slashes for the "Linux/Unix shells" mode, regardless of the operating system it's currently running on. Fixes #3155.
Build system changes:
The Qt library is now required for building all applications, even the
command-line ones, as they use Qt's MIME type detection capabilities. In
turn this means that you cannot disable the Qt usage anymore; either Qt5 or Qt 6 is required.
You can still chose not to build MKVToolNix GUI, though. A new option has
been added to `configure` for this purpose: `--disable-gui`.
The `gmp` library is now required.
The `magic` library is not used anymore.
The `PCRE2` & `JPCRE2` libraries are not used anymore. The bundled version of `JPCRE2` was removed.
Boost's "rational" library is not used anymore.
`configure`: the option `--enable-appimage` has been removed. The location of the relevant directories within an AppImage is now detected automatically.
The bundled `fmt` library was updated to v8.0.0.

New in MKVToolnix 58.0.0 (Jun 13, 2021)

New features and enhancements:
mkvmerge, MKVToolNix GUI's multiplexer: the handling of the "default track" flag has been changed to match the recent changes to the Matroska specifications. The new semantics are that if it is set, it is supposed to signal to the player that this track is eligible for being played by default, potentially taking other factors such as user preferences regarding languages into account.
This implies that more than one track of each type can have this flag set. For example, a Blu-ray disc with three audio tracks might have the main audio in both English and Japanese, whereas the third audio track contains the director's comments. In such a case the first two tracks should have the "default track" flag set, the third one shouldn't.
Earlier `mkvmerge` was enforcing that only one track of each type could have the flag set. This restriction has been removed, both in `mkvmerge` and in the GUI's multiplexer.
`mkvpropedit` and the GUI's header editor are unaffected as they've always allowed to set the flag on as many tracks as the user wanted.
mkvmerge: AVC/H.264 & HEVC/H.265 identification: added the stream's pixel dimensions (AVC only; were present for HEVC already) & default duration. Implements #3116.
mkvmerge, mkvextract: HEVC/H.265: added support for reading single-layer Dolby Vision from Annex B type bitstreams (elementary streams, MPEG transport streams). Patch by quietvoid. Implements #3113.
mkvinfo: the option `-X`/`--full-hexdump` now affects all binary elements, not just the frame data in `SimpleBlock` and `BlockGroup` elements.
MKVToolNix GUI: multiplexer: the "delay" and "sync" options can now be used for chapters in source files, too. Implements #3129.
MKVToolNix GUI: when moving list entries up & down with the optional buttons or the keyboard shortcuts (instead of using drag & drop), the GUI ensures that the top-most selected entry remains visible after the move. Implements #3123.
MKVToolNix GUI: added an option in the preference to use legacy MIME types for font attachments instead of the current standard ones (e.g. 'application/x-truetype-font' instead of 'font/sfnt' and 'font/ttf').
Bug fixes:
build system: fixed filtering out optimization options when compiling the file `iso639_language_list.cpp` (before only numeric optimization levels were filtered out and only if it wasn't the last option in the list of flags). See #3105 for context.
build system: when libmagic was detected via `pkg-config`, MKVToolNix was actually compiled without support for libmagic due to a preprocessor symbol not being defined.
mkvmerge: MP4 reader: fixed an issue with timestamps overflowing when the file's or the track's time scale is large. Fixes #3124.
mkvmerge, mkvextract: fixed key frame handling for `BlockGroup` elements with a forward reference but no backward references. Patches by Tom Yan.
mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: the programs will no longer omit writing mandatory elements set to their default value if other elements of the same type are present in the same master. This affects mostly the "chapter language" element which may occur multiple times within the same "chapter display" master. If it does occur multiple times and one of them is set to "English" (which is that element's default value), that element will now be written, too. Part of the fix of #3120.
mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: when parsing chapter files IETF & legacy language elements as well as legacy country elements will now be properly generated depending on which exist already, especially when there's more than one language and/or country element in a "chapter display" element. Part of the fix of #3120.
mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: fixed reading OGM-style chapter files with timestamps that don't have exactly three decimal places. Any number of decimal places between one and nine is now supported for nanosecond precision. Fixes #3121.
MKVToolNix GUI: chapter editor: added/fixed support for "chapter display" elements with multiple languages or countries. Part of the fix of #3120.
Build system changes:
Qt 6: added support for building with Qt 6. `configure` will look for Qt 6 first and only continue looking for Qt 5 if Qt 6 isn't found or disabled via `--disable-qt6`.
Qt 6 detection works by first looking for the `qmake6` binary. Its location can be specified with the `--with-qmake6=…` option.
All other Qt 6 related facts (such as compiler & linker flags or the position of the other required tools such as `lconvert`, `moc`, `rcc` and `uic`) will be derived from the output generated by `qmake6`.
Note that at this point Qt 6 is not yet supported for the cross-compilation build to Windows, nor is a static Qt 6 build supported yet.
Note that the command line options `--enable-static-qt`, `--with-qt-pkg-config-modules` and `--without-qt-pkg-config` only apply to the Qt 5 and have no effect on Qt 6.
Qt 5: the options for specifying the position of the tools (`--with-moc=…`, `--with-rcc=…` and `--with-uic=…`) have been removed. Their position will now be derived from the output generated by `qmake`.
`configure`: completely disabling the GUI now requires passing both `--disable-qt6` and `--disable-qt` options.
Boost's multi-precision library is now required.
Boost v1.66 or newer is now required.
Other changes:
The Windows build is now using an updated version of the `file`/`magic` library for MIME type detection of attachments. This affects fonts whose MIME types will now be the current standard MIME types (e.g. `font/sfnt` or `font/ttf` for TrueType fonts). As this might pose problematic with older players that only support the legacy MIME type (e.g. `application/x-truetype-font`), a new option was added in the GUI's preferences to use the legacy MIME types instead of the current standard ones. This is off by default. Builds for other operating systems have already been using newer versions of the `file`/`magic` library for a long time.

New in MKVToolnix 57.0.0 (May 23, 2021)

New features and enhancements:
mkvmerge: MP4 reader: added support for reading Dolby Vision from MP4 files (FourCCs `dvh1` and `dvhe`; configuration records `dvcC`, `dvvC` and `hvcE` will be converted into block addition mappings). Implements #2784.
mkvmerge: SRT subtitles: mkvmerge now accepts empty text files with the extension `.srt` as SRT subtitle files, enabling the creation of empty SRT tracks. Implements #3089.
mkvmerge, mkvextract: HEVC/H.265: access unit delimiter NALUs will no longer be discarded, neither during muxing nor during extraction.
MKVToolNix GUI: preferences: switched the order & wording of controls in the "enabling items" panel to make it clearer that certain controls define exceptions. Inspired by 3086.
Bug fixes:
mkvmerge: HEVC/H.265 parser: several NALU types, notably the Dolby Vision-specific NALUs ("unspecified 62" and "unspecified 63") and suffix SEI NALUs, are now stored with the frame they belong to instead of with the next frame. Part of fixing & implementing #2784, #2818, #3093 and #3113.
mkvmerge: HEVC/H.265 packetizer: fixed setting the track's default duration when reading HEVC/H.265 from Matroska files that don't have a default duration set.
mkvmerge: HEVC/H.265 packetizer: fixed the calculation of the duration of frames so that `SimpleBlock` elements can be used again instead of `BlockGroups` with `BlockDuration` elements. Fixes #3114.
mkvmerge, mkvextract: HEVC/H.265 parser: fixed issues with ordering & duplication of certain NALUs (parameter set & prefix SEI NALUs). Part of fixing & implementing of #2784, #2818, #3093 and #3113.
MKVToolNix GUI: multiplexer: when dragging & dropping files to the multiplexer, the source directory will be remembered as the "last open directory" again, causing subsequent uses of the "open file" dialog to start in the same directory. Fixes #3110.
mkvinfo: fixed the position of frames in block groups containing "block duration" elements in summary mode (e.g. for subtitle tracks).
Build system changes:
`configure` will now try to detect `libmagic` via `pkg-config` and fall back to including & linking directly if it cannot be found via `pkg-config`.

New in MKVToolnix 56.1.0 (Apr 10, 2021)

New in MKVToolnix 56.0.0 (Apr 5, 2021)

New features and enhancements:
mkvmerge, mkvpropedit: tags: the programs will no longer write tag elements that are mandatory and set to their default value (e.g. "tag language" set to `und` = undetermined)
mkvmerge, mkvpropedit, MKVToolNix GUI chapter editor: chapters: the programs will no longer write chapter elements that are mandatory and set to their default value (e.g. "chapter language" set to `eng` = English or "Chapter flag enabled" = 1)
mkvextract: chapters: mkvextract will no longer add a `ChapterLanguage` element set to `eng` to the generated XML content if the source file doesn't contain such an element
MKVToolNix GUI: multiplexer: when using the "tab widget below the files & tracks" layout option for the track properties the elements in the "general options" tab will use six rows à four columns instead of twelve rows à two columns, greatly reducing the required height. Implements #3062
Bug fixes:
mkvmerge: AAC reader: fixed mkvmerge aborting to read AAC files bigger than 2 GB with a message about not being able to allocate memory. Fixes #3059
mkvmerge: chapters: `ChapLanguageIETF` elements were still created when the option `--disable-language-ietf` was given after an option leading to the creation of chapters. Now the position doesn't matter anymore. Part of the fix of #3069
mkvmerge: chapters: when the option `--disable-language-ietf` is used ChapLanguageIETF` elements won't be written even when sources are read Matroska files or XML chapters files) that do contain those elements. Part of the fix of #3069
mkvmerge: tags: when the option `--disable-language-ietf` is used TagLanguageIETF` elements won't be written. Fixes #3070
mkvmerge: tags: mkvmerge will no longer write language elements for the track statistics tags it creates, making the effective language "undetermined" due to `und` being the default value for the legacy tag language element. Fixes #3073
mkvmerge: tags: the XML tag parser will now validate all `<Simple>` children of `<Tag>` elements, not just the first for each `<Tag>`. Part of the fix of 3071
mkvmerge: tags: the XML tag parser now uses the spec-compliant `und` "undetermined") as the default language for `<Simple>` tags instead of eng`. Part of the fix of #3071
mkvmerge, mkvpropedit: tags: mkvmerge will no longer set the "target type" for track statistics tags (earlier it used `MOVIE`). The "target type value" will still be set to `50`. Fixes #3074
mkvmerge, mkvextract: HEVC/H.265: both programs will now normalize the placement of VPS, SPS and PPS NALUs. Each key frame is prefixed with exactly one copy of the currently active parameter sets. This fixes certain classes of bugs related to splitting/appending. Fixes #3034
mkvinfo: when compiled with newer versions of the `fmt` library, certain numbers were not output correctly (e.g. a track's audio sampling frequency of 48000 might be output as 48)
MKVToolNix GUI: multiplexer: deriving the track language from the file name will match languages case insensitively again (like versions prior to v55). Fixes #3068
MKVToolNix GUI: multiplexer: under certain circumstances keyboard shortcuts such as `Ctrl+W` for closing the active tab or `Ctrl+R` for starting to multiplex ceased to work until the user did certain other things (such as switching to a different tool & back to the multiplexer or opening the multiplexer menu). This started with v54. Fixes #3051
MKVToolNix GUI: chapter editor: the editor will no longer create empty ChapterCountry` elements when adding a chapter name with no default country selected in the preferences. Fixes #3072

New in MKVToolnix 55.0.0 (Mar 6, 2021)

Bug fixes:
All programs, only on Windows: fixed checking existence of & creating directories with UNC paths such as `\serversharefolderfile.mkv`. Fixes
#3041.
All programs, only on Windows: implemented several workarounds for bugs in `std::filesystem` wrt. UNC paths. The effect of those bugs was that Blu-rays and DVDs couldn't be added from UNC paths. Fixes #3037.
Mkvmerge, only on Windows: fixed non-ASCII characters getting mangled in the destination file name when splitting is active.
MKVToolNix GUI, only on Windows: fixed the GUI hanging when trying to browse for files on drives that don't actually exist. Fixes #3046.
MKVToolNix GUI, only on Windows: the GUI did not remember UNC paths as the "most recently used source directory" properly.
MKVToolNix GUI: only on Windows: when dragging & dropping files from other applications to MKVToolNix GUI the GUI will force the drop action to be a copy action, no matter which keys were pressed by the users. This prevents Windows Explorer from deleting the dragged file when the user presses shift while dropping the file onto MKVToolNix GUI.
MKVToolNix GUI, only on Windows: when using the file dialog for selecting a file name to save to (e.g. when browsing for the destination file name in the multiplexer or saving an attachment in the header editor) non-ASCII characters in the default file name were mangled. Fixes #3049.
MKVToolNix GUI: multiplexer: the user can now configure what to do when using the "Add source files" button independently of the setting for what happens when files are dragged & dropped onto the GUI. The same options are available, but they're distinct settings, allowing for different use cases. Fixes #3035.
MKVToolNix GUI: multiplexer: deriving the track language from file names doesn't use one big regular expression of all enabled languages anymore. Instead, the file name is split into parts on a list of character (such as `.` or `(` and `)`; configurable in the preferences). This prevents the regular expression becoming too big for the regular expression library to handle when many languages are enabled. Fixes #3048.
MKVToolNix GUI: preferences: the language lists for "deriving track languages" and "enabling items by language" always included all the ISO 639-3 languages, even if those weren't enabled in the "often-used languages" pane. Fixes #3047.
Other changes:
Mkvmerge, MKVToolNix GUI multiplexer: the functionality for changing the length of the NALU "size" field for AVC/H.264 and HEVC/H.265 tracks has been removed. The corresponding command-line option will continue to be recognized by mkvmerge as not to break existing third-party applications, but it won't actually do anything.

New in MKVToolnix 54.0.0 (Feb 26, 2021)

New features and enhancements:
mkvmerge: added support for using ISO 639-3 language codes in IETF BF47 language tags. Part of the implementation of #3007.
mkvmerge: AC-3 parser: added support for byte-swapped AC-3 data. Implements 3022.
mkvmerge: Matroska reader: for audio tracks that have the bit depth track header set mkvmerge will now keep that header even for codecs that don't require it for decoding. Implements #3009.
mkvmerge: MPEG transport stream reader, PCM audio tracks: mkvmerge will now re-order the channels for 5.1, 7.0 and 7.1 channel tracks from the Blu-ray layout to the WAVEFORMATEXTENSIBLE layout expected in Matroska. Patch by Tom Yan. Implements #2988.
mkvmerge, mkvinfo, mkvpropedit, MKVToolNix GUI: added support for the following new track header elements: "hearing impaired" flag, "visual impaired" flag, "text descriptions" flag, "original" flag, "commentary"flag. Implements #3011.
MKVToolNix GUI: added support for using ISO 639-3 language codes in IETF BF47 language tags. As there are several thousand of them, they're deactivated by default and must be activated in the preferences ("GUI" ? "Often used selections" ? "Languages"). Part of the implementation of #3007.
MKVToolNix GUI: multiplexer: when adding Blu-rays the user can select multiple playlists to add simultaneously in the "select playlist to add" dialog. Implements #2961.
MKVToolNix GUI: multiplexer: the file name extensions "eb3" and "ec3" were added for Dolby Digital Plus & "mpl" for Dolby TrueHD in the file dialogs. Part of the implementation of #3027.
MKVToolNix GUI: multiplexer: when adding multiple files the dialog asking the user what to do with them has gained a new checkbox. If enabled, all files containing at least one video track will always be placed in newly created multiplex setting. Implements #2966.
MKVToolNix GUI: multiplexer: added a menu entry in the "Multiplexer" for adding all files that are currently in the clipboard. Implements #3006.
Bug fixes:
all: Windows: fixed compatibility with gettext 0.21 and newer on mingw.
all: Windows: fixed several of the programs having problems with certain
Unicode characters (primarily emojis) in file names (e.g. mkvextract wrongfully complaining about an "invalid mode" or the GUI not being able to find parts of Blu-ray file structures).
mkvextract: AAC: fixed wrong channel mask field in the ADTS headers for 7.1 channel layouts. Fix by Tom Yan. Fixes #2636.
mkvextract: h.265/HEVC extraction: if the first frame starts with the parameter sets (SPS, PPS & VPS), the ones from CodecPrivate aren't written and the ones from the first frame are kept. Fixes #3031.
mkvmerge: fixed the calculation of chapter timestamps read from NTSC DVDs. Fix by Tom Yan.
MKVToolNix GUI: IETF BCP 47 language widget: the language combo box will now always contain the language code the user enters in the free-form field, even if it isn't in the list of often-used languages the user configured in the preferences.
MKVToolNix GUI: multiplexer: when browsing for the destination file name the default directory is now chosen according to the preferences regarding how the destination file name should be formed. For example, if the policy is set to "fixed output directory" then that output directory will be the one initially set when the directory selection dialog is opened. Fixes #3021.
MKVToolNix GUI: multiplexer: fixed the removal of appended source files if the "delete source files" end-of-job action is enabled. Fixes #3029.
MKVToolNix GUI: chapter editor: when importing chapters from DVDs the IETF BCP 47 language elements will be set, too, not just the legacy language elements.
Build system changes:
libEBML v1.4.2 and libMatroska v1.6.3 are now required. The optional, bundled copies of both libraries have been updated to those versions. This bump in requirements fixes several heap overflow bugs in libEBML.
MKVToolNix is now using the C++17 library feature "file system library" instead of Boost's "file system" and "system" libraries. For the GNU Compiler Collection (gcc) libstdc++ this means v8 or newer is required; for clang's libc++ it means v7 or newer. For macOS this means that provided disk image will only run on 10.15 "Catalina" or newer.

New in MKVToolnix 53.0.0 (Jan 31, 2021)

New features and enhancements:
mkvmerge: AVI reader: added support for reading the video aspect ratio from the video properties header (`vprp` chunk) if present and setting the display dimensions accordingly. Implements #2993.
mkvmerge: MP4 reader: for h.264/AVC tracks that don't have an AVCConfigurationBox` (`avcC` atom) in their sample description (`stsd`) atom or whose `avcC` atom contains no content `mkvmerge` will now re-derive the `AVCConfigurationBox` from the bitstream. Implements #2995.
mkvextract: mkvextract will now check if any of the destination file names is the same as the source file name and abort with an error if that's the case. Implements #3001.
MKVToolNix GUI: when querying the user for a file name for saving things e.g. multiplexer settings or an attachment in the header editor), the automatically suggested file name will now be based on the situation-specific file names (e.g. the destination file name for multiplexer settings or the attachment's name when saving an attachment in the header editor) instead of the directory's name. Implements #3012.
MKVToolNix GUI: multiplexer: when deriving track languages from file names the GUI will now select the right-most match instead of the left-most
one. For example, "La.vie.en.rose.(fr).srt" will now be detected as French fr) instead of English (en). Implements #3013.
MKVToolNix GUI: preferences: the items in the "pre-defined …" lists can now be renamed by double-clicking with the mouse or pressing the F2 key. Windows installer: the `bluray_dump` command-line utility will be installed into the `tools` sub-directory. `bluray_dump` can read & dump certain file types used on Blu-rays: `.mpls` playlists, `.clpi` clip information databases, `.bdmv` index files, `bdmt_….xml` disc library databases and tnmt_….xml` track & chapter name databases.
Bug fixes:
mkvmerge: stretching chapter timestamps with `--chapter-sync` now works correctly with floating point values including fractions of floating point numbers (e.g. `12.3/45.67`). The tooltips in the GUI have been adjusted accordingly. Fixes #3002.
mkvmerge: MPEG 1/2 video handling: the "default duration" header field was often half the value it actually should be, resulting in all video frames having an explicit block duration with the correct value. This has been fixed with a patch by Tom Yan.
mkvmerge: MPEG 1/2 video handling: the data stored in `Codec private` and Codec state` doesn't contain extensions other than sequence & sequence display extensions anymore. Fix by Tom Yan.
mkvmerge: tag handling: when remuxing a Matroska file with the no-track-tags`, existing `SOURCE_ID` track tags are now skipped, too.
MKVToolNix GUI: multiplexer: the drop-down boxes with pre-defined track names now follow the order set in the preferences instead of sorting the entries alphabetically. Fixes #2999.

New in MKVToolnix 52.0.0 (Jan 4, 2021)

New in MKVToolnix 51.0.0 (Oct 4, 2020)

New features and enhancements:
mkvmerge, mkvpropedit, MKVToolNix GUI: IETF BCP 47 language tags: added missing support for UN M.49 regions for which there are no corresponding ISO 3166 alpha codes. This enables language tags such as `es-419` = Spanish in Latin America and the Caribbean. Implements #2919.
MKVToolNix GUI: IETF BCP 47 language tags: the text in the widget displaying the current language & the corresponding edit button is now displayed like a link (depending on the theme: different color & underlined), making it clearer that not just the edit button can be clicked but the text, too.
Bug fixes:
mkvmerge: AV1 parser: fixed mkvmerge crashing after uncaught exceptions due to certain data conditions. Found by fuzzying.
mkvmerge: AV1 packetizer: the duration of frames wasn't set properly. When appending AV1 IVF or OBU files this meant that the last frame of the Nth file and the first frame of file N+1 had the same timestamp. Fixes #2937.
mkvmerge: DTS reader: fixed handling of buffers with an odd length when byte-swapped DTS is detected so that mkvmerge doesn't abort with a failed assertion. Found by fuzzying.
mkvmerge: h.264/AVC and h.265/HEVC elementary stream readers: mkvmerge will no longer claim to recognize data that looks like AVC or HEVC but with invalid video width/height values as that lead to failed assertions in libEBML later. Found by fuzzying.
mkvmerge: h.265/HEVC parser: fixed mkvmerge aborting after uncaught exceptions due to certain data constellations found by fuzzying.
mkvmerge: IVF reader: fixed mkvmerge crashing with a "division by zero" error due to certain data conditions. Found by fuzzying.
mkvmerge: fixed mkvmerge aborting with a "division by zero" error due to the timestamp scaling factor being 0 after handling certain data constellations found by fuzzying.
mkvmerge: track statistics: fixed a "division by zero" error when the content's shorter than 1ms. Found by fuzzying.
mkvmerge, mkvinfo, mkvextract, mkvpropedit: Matroska access class: fixed an invalid memory access under certain data conditions. Found by fuzzying.
MKVToolNix GIU: IETF BCP 47/RFC 5646 language tags: the GUI will no longer open the language dialog when clicking on a disabled language display widget.
MKVToolNix GUI: IETF BCP 47 language tags: the "variants" combo-boxes were not populated even when the language tag was valid and contained at a variant. Fixes #2923.
MKVToolNix GUI: IETF BCP 47 language tags: when no language is selected, at least one of the other components (extended subtags, region, or variants) has something selected and "private use" is not empty, the GUI would claim this to be a valid tag, which it isn't. Fixes #2924.
MKVToolNix GUI: multiplexer: when the tracks/chapters/tags selection changes from "at least one entry selected" to "no entry selected", the input controls will be reset to their default state and not just disabled. Fixes 2927.
Build system changes:
configure` now checks for the presence of the a system-wide installed copy of the JPCRE2 C++ wrapper library for the PCRE2 library and uses that if it's new enough (at least v10.32.1). If not, the bundled version will be used as a fallback. Implements #2929.

New in MKVToolnix 50.0.0 (Sep 6, 2020)

New feature: IETF BCP 47 language tags:
I've written up a [nice FAQ entry](https://gitlab.com/mbunkus/mkvtoolnix/-/wikis/Languages-in-Matroska-and-MKVToolNix) about the switch to using IETF BCP 47 language tags, how they interact with legacy language elements, how the programs actually behave and how to disable their use if necessary.
mkvmerge: IETF BCP 47/RFC 5646 language tags: mkvmerge will now accept full BCP 47 language tags for all options taking a language. mkvmerge will always write "LanguageIETF" track header elements. If the language tag contains a valid ISO 639-2 language code it will also set the legacy "Language" track header element to the included ISO 639-2 code. Part of the implementation of#2419.
mkvmerge: IETF BCP 47/RFC 5646 language tags: if present the "LanguageIETF" track header element will be reported as the`language_ietf` property in JSON identification mode. Part of the implementation of #2419.
mkvmerge: IETF BCP 47/RFC 5646 language tags in chapters: mkvmerge will now write "ChapLanguageIETF" elements when creating chapter atoms, either when reading the simple chapter format or when generating chapters due to the `--generate-chapters` command line option. Part of the implementation of #2419.
mkvmerge: IETF BCP 47/RFC 5646 language tags in tags: mkvmerge will now write "TagLanguageIETF" elements when creating "simple tag" elements, either when reading tag XML files or when generating them. Part of the implementation of #2419.
mkvmerge: IETF BCP 47/RFC 5646 language tags: added an option `--disable-language-ietf` that causes mkvmerge to only write the legacy language elements.
mkvmerge, mkvpropedit, MKVToolNix GUI's chapter editor: IETF BCP 47/RFC 5646 language tags in chapters: when reading XML chapter files the programs will now add "ChapLanguageIETF" elements for atoms that don't contain them. The values are derived from existing "ChapterLanguage" elements. Part of the implementation of #2419.
mkvpropedit: IETF BCP 47/RFC 5646 language tags: setting/deleting the track language now acts on both the old language element as well as the "LanguageIETF" track header element. Part of the implementation of #2419.
mkvpropedit: IETF BCP 47/RFC 5646 language tags: added an option`--disable-language-ietf` that causes mkvpropedit to apply changes to the`language` track header property only to the legacy language track header element.
mkvinfo: IETF BCP 47/RFC 5646 language tags: added support for the "LanguageIETF" track header element. Part of the implementation of #2419.
MKVToolNix GUI: multiplexer: added full support for IETF BCP 47/RFC 5646 language tags for both track and chapter languages. Part of the implementation of #2419.
MKVToolNix GUI: chapter: added full support for IETF BCP 47/RFC 5646 language tags for chapter languages. Part of the implementation of #2419.
MKVToolNix GUI: header editor: added full support for IETF BCP 47/RFC 5646 language tags for track header languages. The header editor allows editing of the legacy language elements and the IETF BCP 47 language elements independent of each other. Part of the implementation of #2419.
Other new features and enhancements:
mkvmerge: the chapter generation mode `when-appending` now also works with the splitting modes `parts:` & `parts-frames:` when using the `…,+…` syntax for appending other sections of the source file to the same destination file. Implements #2898.
MKVToolNix GUI: multiplexer: the file selection dialogs now include the extension `.dtsma` for DTS files. Implements #2901.
mkvmerge: MP4 reader: sped up parsing MP4 DASH files with a lot of segments (`trun` atoms) quite a bit. Part of the fix of #2900.
The PCRE2 regular expression library is now used instead of `std::regex` for big performance improvements in all places where regular expressions are used for parsing big chunks of text, e.g. in the subtitle parsers. Part of the fix of #2899.
all programs: Windows: all programs now support long file names on Windows 10 release 1604 if they're turned on in the registry. Implements #2916.
Bug fixes:
MKVToolNix GUI: preferences: under certain conditions changing the selected entry in the page tree on the left did not cause the page shown on the right to be updated. Fixes #2895.
mkvmerge: splitting text by a fixed string (e.g. `,`) is now done by using `std::string.find()` instead of using a regular-expression-based text splitting function, greatly improving its performance. Part of the fix of #2899.
mkvmerge: mkvmerge will now read-buffer file I/O when probing text file formats which increases its speed significantly on Windows. Part of the fix of #2899.
mkvmerge: MP4 reader: fixed handling of `tkhd` atoms of version 1. Fixes #2900.
Build system changes:
The PCRE2 library (the 8-bit variant) is now required.

New in MKVToolnix 49.0.0 (Aug 3, 2020)

New features and enhancements:
mkvmerge: added support for copying the new track header elements `BlockAddIDName`, `BlockAddIDType`, `BlockAddIDValue` and `BlockAddIDExtraData` from Matroska files if they exist. Part of the implementation of #2887.
mkvinfo: added support for the new track header elements`BlockAdditionMapping`, `BlockAddIDName`, BlockAddIDType`, `BlockAddIDValue` and `BlockAddIDExtraData`. Part of the implementation of #2887.
MKVToolNix GUI: multiplexer: the list of recent directories can now be edited in the preferences ? "Multiplexer" ? "Destination file name". Implements #2861.
MKVToolNix GUI: preferences: the values in the various "predefined values" lists can now be re-ordered freely by dragging & dropping.
Bug fixes:
mkvmerge: Matroska reader: when reading tracks (e.g. a subtitle track) from Matroska files with their `default track` flag set to `yes`, and whenoverwriting those via the command line to `no`, `mkvmerge` would not promote additional tracks of the same type from other files (e.g. another subtitle track from an SRT file). Fixes #2863.
mkvmerge: SRT reader: empty lines inside entries were doubled. Fixes #2888.
mkvmerge: subtitles: when calculating the rounded duration of each entry the error from rounding the corresponding timestamp will be taken into account. Fixes #2890.
mkvextract: SSA/ASS extraction: mkvextract is no longer inserting empty lines before the `Dialogue:` lines. Fixes #2876.
mkvextract: USF subtitles: start & end timestamps were too high by a factor of 1.000.000. Fixes #2875.
MKVToolNix: info tool: when saving to a text file the checkbox "Save as default for saving output to text files" did nothing. Fixes #2869.
MKVToolNix: info tool: when saving to a text file in "all elements in a tree-like structure" mode, the GUI always stopped at the first cluster regardless of the setting of the "verbosity" option.
MKVToolNix GUI: preferences: when tooltips were disabled the dialogs foradding new entries to the various "predefined values" lists were missing their texts.
Windows installer: the images are shown again. Fixes #2868.
configure: fixed detection of QtDBus. Fixes #2886.
Build system changes:
libMatroska v1.6.1 is now required. The bundled version has been updated to that version.

New in MKVToolnix 48.0.0 (Jun 28, 2020)

New features and enhancements:
Mkvmerge: AC-3: file identification will report AC-3 tracks encoded in Dolby Surround EX as codec "AC-3 Dolby Surround EX". Implements #2740.
MKVToolNix GUI: multiplexer: on new installations the GUI will now recognize all known ISO 639-2 language codes in file names by default instead of only the top 100 of languages by native speakers.
MKVToolNix GUI: multiplexer: on new installations the list of "often used languages" will by default only contain certain agnostic ones ("multiple languages", "no linguistic content", "reserved for local use", "uncoded languages"), "English" and the default user interface language. The "list of spoken languages by native speaks" isn't used anymore. Also implements #2716.
MKVToolNix GUI: header editor: added an option to remove all attachments to the tree context menu. Implements #2835.
MKVToolNix GUI: while the GUI is running it will remember the last page that was selected when the preferences dialog is closed. Upon re-opening the preferences that page will be selected by default. Implements #2852.
Bug fixes:
Mkvmerge: fixed a segmentation fault when exiting prematurely due to write errors such as the destination having run out of space. Fixes #2843.
Mkvmerge: DTS: fixed wrong channel count for DTS tracks with XCh extensions. Fixes #2715.
Mkvmerge: MPEG TS reader: fixed detecting h.264/AVC and h.265/HEVC tracks that consist of only a single frame. Part of the fix of #2849.
Mkvmerge: MPEG TS reader: fixed handling of unbounded PES sizes for tracks that consist of only a single PES packet. Part of the fix of #2849.
Mkvmerge: MPEG TS reader: PGS subtitle tracks are now exempt from the "detect bogus subtitle timestamps" heuristic which could lead to some PGS subtitles not being timestamped correctly. Symptoms were that they were shown at the wrong time or that they were shown indefinitely. Fixes #2736 and partially fixes #2824.
Mkvmerge: MPEG TS reader: when reading MPLS playlists the start timestamps of a play items were handled wrong: all the timestamps of packets read were compared to that start timestamp, dropping those packets whose timestamps were smaller than the play item's start timestamp. The correct behavior is to accept all packets as soon as the first one with a timestamp equal to or larger than the play item's start timestamp is encountered. This could result in PGS subtitle entries located right at the start of the play item being garbled/lost as they consist of multiple PES packets for which some timestamps are often slightly smaller. Part of the fix of #2824.
Mkvmerge: MPEG TS reader: when reading MPLS playlists mkvmerge will no longer read the whole M2TS files they reference, processing only the packets lying inside the timestamp range given by the playlists's play item's start & end timestamps. Instead mkvmerge will use the index information present in corresponding clip information (CLPI) files in order to seek to the nearest file position of the play item's start timestamp. Additionally mkvmerge will simply stop processing a file once the end timestamp is seen. This change greatly speeds up processing files from which only small portions must be read. Part of the fix of #2824.
Mkvmerge: WavPack: fixed support for files created by v5 of the program. Checksums, DSD audio data and non-standard sampling rates are handled correctly. Patch by David Bryant.
MKVToolNix GUI: multiplexer: fixed the cursor being positioned wrong after entering or pasting characters that aren't allowed in file names into the "destination file" control. Fixes #2855.
Build system changes:
LibEBML v1.4.0 and libMatroska v1.6.0 are now required.
Other changes:
The source code repository's main development branch was renamed to `main`.

New in MKVToolnix 47.0.0 (May 31, 2020)

New features and enhancements:
mkvmerge: chapters: mkvmerge can now read chapters from DVDs if the user specifies the path to a DVD folder structure via the `--chapters …` parameter. By default chapters from the first title will be imported. This can be changed by append `:<title number>` to the file/directory name in the `--chapters …` argument, e.g. `--chapters /srv/dvds/BigBuckBunny/VIDEO_TS:3`. This feature requires mkvmerge to have been built with the `libdvdread` library. Part of the implementation of #2808.
mkvmerge: added `--engage append_and_split_flac` that enables mkvmerge to append and split FLAC tracks, restoring pre-v45 behavior. The resulting tracks will be broken: the official FLAC tools will not be able to decode them and seeking will not work as expected.
MKVToolNix GUI: multiplexer: added support for mkvmerge's new support for reading chapters from DVDs if both have been built with the `libdvdread` library. Part of the implementation of #2808.
MKVToolNix GUI: multiplexer: when deriving languages from file names the GUI will now look for simplified language names instead of the full ones (e.g. instead of looking for "Greek, Modern (1453-)" it would simply look for "Greek").
MKVToolNix GUI: multiplexer: the options in the "additional command-line options" dialog are now sorted alphabetically. Additionally the `--append-mode` option has been added as one of the only missing global options.
MKVToolNix GUI: chapter editor: the chapter editor can now read chapters from DVDs if MKVToolNix has been build with the `libdvdread` library. Part of the implementation of #2808.
MKVToolNix GUI: header editor: added an option in the preferences for displaying all date & time values in UTC instead of the local time zone. Implements #2814.
Bug fixes:
all: fixed a crash when using the `MTX_LOGGER=file` syntax for logging debug messages without specifying a file name to log to. It will now log to a file called `mkvtoolnix-debug.log` in the system's default temporary directory, as initially intended.
Build system changes:
The [`libdvdread`](https://www.videolan.org/developers/libdvdnav.html) library will be used if found via `pkg-config`. If it is found, support for reading chapters from DVDs will be enabled in `mkvmerge` and the MKVToolNix GUI. Part of the implementation of #2808.
Boost's Date/Time, Lexical Cast, Range, Range Adaptors, Tri-Bool, Variant libraries are not used anymore.
MKVToolNix now requires a C++ compiler & standard library that support the following features of the C++17 standard: "`std::variant`", "`std::gcd`". For the GNU Compiler Collection (gcc) this means v7 or newer; for clang it means v4 or newer — the same versions required by earlier MKVToolNix versions.
MKVToolNix now requires version 6.1.0 of fmtlib or later for the `fmt::to_string` function and bugfixes to the formatting of floating point numbers. If a system-wide version is installed that's older, the bundled copy will be used.
The bundled version of fmtlib has been updated to release 6.2.1.

New in MKVToolnix 46.0.0 (May 1, 2020)

New features and enhancements:
mkvmerge: when splitting, the placeholder `%c` can be used in the destination file name. It'll be replaced by the name of the first chapter in the file. Implements #2791.
mkvmerge: when reading MPLS playlists mkvmerge will include a tag named`SOURCE_ID` in the track's statistics tags that conveys the fact that the source was a Blu-ray and what the track's ID was in the source container. When reading Matroska file existing `SOURCE_ID` tags will be kept. The format used is the same format MakeMKV uses. Implements #2774.
mkvmerge: for audio-only files mkvmerge will now write a cue entry every 500ms instead of every 2s.
MKVToolNix GUI: job actions: split up the option "execute when the job finishes successfully or with warnings" into two separate options: "…when finishes successfully" and "…when exits with warnings". Implements #2798.
Bug fixes:
mkvmerge: Matroska reader: when regenerating UIDs for chapters mkvmerge will now fix referencing tag chapter UID targets to have the same values. Fixes #2804.
mkvmerge: MP4 reader: fixed a crash that could potentially happen while trying to identify H.265/HEVC tracks.
mkvmerge: MP4 reader: when reading H.265/HEVC tracks without a frame offset table (`ctts` atom) present, mkvmerge did not parse the `hevcC` structure correctly in certain cases, causing no video frames to be output at all or the output not being playable. This fixes #2782, a bug introduced in v45.
mkvmerge: MPLS handling/MPEG TS reader: timestamp restrictions as given in an MPLS file were only honored for the first play item, not for subsequent play items. For those play items the whole referenced file was always copied. Part of the fix of #2789.
mkvmerge: MPLS handling/MPEG TS reader: under certain circumstances mkvmerge copied one frame too many before switching to the next play item. Part of the fix of #2789.
mkvmerge: for audio-only files cues will only be created for I frames (important for e.g. TrueHD where decoding can only start on a sync frame). Fixes #2790.
MKVToolNix GUI: fixed a crash that happened when closing the preferences after having closed at least one multiplexer tab. Fixes #2785.
MKVToolNix GUI: macOS: changed the default of the "elide tab header labels" feature introduced in v45 from "no" to "yes" to mirror how versions before v45 behaved on macOS.

New in MKVToolnix 45.0.0 (Apr 4, 2020)

New features and enhancements:
mkvmerge: mkvmerge has never supported appending & splitting FLAC audio tracks. mkvmerge will now emit error messages when the user attempts either instead of continuing and creating invalid FLAC tracks.
MKVToolNix GUI: added an option in the preferences to turn on eliding text on tab headers. If enabled, tab names will be shortened so that all tab headers fit into the window's width. Implements #2768.
MKVToolNix GUI: added an option in the preferences to disable all tooltips.
MKVToolNix GUI: Windows: debug output sent via Qt's to Windows' debugging facility will use a more verbose message format including the application name, making it easier to filter for in SysInternal's "Debug View" utility.
MKVToolNix GUI: multiplexer: if the file identification fails due to a JSON parser error, the output generated by `mkvmerge` will be output via Qt's debugging facility (viewable with SysInternal's "Debug View" utility on Windows; on other systems it's output on `STDERR`) allowing insight into what's gone wrong.
MKVToolNix GUI: multiplexer: if an error occurs during file identification, the name of the processed file will be mentioned in the error message.
MKVToolNix GUI: multiplexer: if an error occurs during identification of multiple files, the GUI will ask the user whether to continue or abort the identification process. Implements #2778.
MKVToolNix GUI: job queue: added an option in the preferences for removing completed jobs when exiting the program depending on their status. Implements #2769.
Bug fixes:
mkvmerge: H.265/HEVC packetizer: fixed changing the NALU size length, it was using the wrong offset into the `hevcC` structure.
mkvmerge: MP4 reader: fixed calculating the duration of video tracks that only contain a single frame. Fixes #2747.
mkvmerge: MP4 reader: if there's no frame offset table (`ctts` atom) present for H.265/HEVC video tracks, mkvmerge will determine the timestamp order itself instead of relying on the timestamps in the MP4 being in the presentation order required by Matroska. Fixes #2777.
mkvpropedit: Windows: mkvpropedit wasn't caching when reading the file to modify, slowing down operations such as adding track statistics tags considerably. Fixes #2761.
MKVToolNix GUI: multiplexer: when using the title as part of the destination file name (both automatically as well as using the "copy title to destination file name" function) all characters that aren't valid in a file name are replaced by hyphens.
MKVToolNix GUI: multiplexer: the "copy title to destination file name" function was broken when the "make file name unique" option in the preferences was disabled. In that case the file base name was removed regardless of what the title was set to at the time.
MKVToolNix GUI: multiplexer: when using the "show command line" menu option on Windows the path to the `mkvmerge` executable was shown with forward slashes instead of backslashes. This is a purely cosmetic fix as Windows supports both forward and backward slashes.
MKVToolNix GUI: multiplexer: when adding Blu-ray playlists the GUI used to only look for the English version of the disc library information (title & cover images). Now the GUI will present all disc library entries in the "select playlist to add" dialog & let the user chose which one to use (ifany). Fixes #2765.
MKVToolNix GUI: multiplexer, info tool: fixed the "warn before overwriting" check wrt. jobs creating the same file. Fixes #2758.

New in MKVToolnix 44.0.0 (Mar 8, 2020)

New in MKVToolnix 43.0.0 (Jan 27, 2020)

New in MKVToolnix 42.0.0 (Jan 2, 2020)

New features and enhancements:
mkvmerge: added an option for creating byte-identical files:
`--deterministic <seed>`. Part of the implementation of #2698.
mkvmerge: Matroska reader: mkvmerge will remove the `icpf` atom headers if they're present in frames read from Matroska files. Implements #2692.
mkvmerge: MP4 reader: ALAC tracks: the number of channels, sampling
frequency and bit depth are now taken from the bitstream in order to fix
bogus values on the container level. Implements #2714.
mkvpropedit: when changing track UIDs the referring elements in existing chapters & tags will be updated automatically, too. Part of the
implementation of #2700.
mkvinfo: when the option `-p`/`--hex-positions` is used, element positions will be output regardless of the verbosity level. Part of the implementation
of #2713.
mkvinfo: added the option `-P`/`--positions` for showing the position of
each element in decimal regardless of the verbosity level used. Part of the implementation of #2713.
mkvinfo: added the option `-o`/`--continue` for continuing processing when the first cluster is encountered regardless of the verbosity level used. Part of the implementation of #2713.
mkvinfo: added the option `-a`/`--all` for outputting all sub-elements (even
cues & seek head entries) and not stopping at the first cluster regardless
of the verbosity level used. Part of the implementation of #2713.
MKVToolNix GUI: multiplexer: added an option in the preferences for
disabling adding cover images from Blu-ray discs. Implements #2693.
MKVToolNix GUI: multiplexer: added mkvmerge's new `--deterministic` option
in the "additional command-line options" dialog. Part of the implementation
of #2698.
MKVToolNix GUI: header editor:: when changing track UIDs the referring
elements in existing chapters & tags will be updated automatically, too. Part of the implementation of #2700.
Bug fixes:
mkvmerge: HEVC ES parser: fixed a bug in the slice parser calculating the
size of a field which in turn could have led to the slice's type being read wrong. Patch by Torsten Hauska. Fixes #2710.
mkvmerge: Matroska reader: fixed a segmentation fault when trying to read a
file that uses header removal compression but no removed bytes are present in the track headers. Fixes #2687.
mkvmerge: MPEG elementary stream parser: fixed an invalid memory access and use of uninitialized memory that could happen under certain
circumstances. Fixes #2690.
mkvmerge: RealMedia reader: fixed a division by zero when all audio
timestamps were zero. Fixes #2689.
mkvmerge: RealMedia reader: fixed an invalid memory access in the video frame assembly code triggered by invalid data in the file. Fixes #2691.
Build system changes:
`std::optional` (C++17 feature) is now used instead of `boost::optional`.
`std::regex` is now used instead of `boost::regex`.
Other changes:
New man page translations into French, Italian, Russian and Chinese
Traditional have been added.

New in MKVToolnix 41.0.0 (Dec 6, 2019)

New features and enhancements:
mkvmerge: Matroska reader: Vorbis tracks: stream comments (aka Vorbis
comments) will be converted to Matroska attachments (for cover arts) and
Matroska track tags (for other comments). Additionally the stream comments
will be removed from Vorbis headers.
mkvmerge: MP4 reader: added support for reading Opus audio from MP4
files. Part of the implementation of #2673.
mkvmerge: MP4 reader: added support for reading VP9 video from MP4
files. Part of the implementation of #2673.
mkvmerge: Ogg reader: Vorbis, Opus & VP8 streams: stream comments (aka
Vorbis comments) will be converted to Matroska attachments (for cover arts)
and Matroska track tags (for other comments). Additionally the stream
comments will be removed from Vorbis headers.
mkvmerge: WAV reader: added support for reading RF64 files.
MKVToolNix GUI: multiplexer: the list of predefined track names is now split
up into three lists, one for each track type (audio, video &
subtitles). Part of the implementation of #2654.
MKVToolNix GUI: multiplexer: when trying to add thumbnails for a Blu-ray the
GUI will determine the thumbnail's pixel size from the thumbnail files if
the XML file doesn't contain that information. This works for JPEG and PNG
files. Implements #2674.
MKVToolNix GUI: general: line edits & combo boxes will now have a "clear
text" button appear whenever they're not empty. Part of the implementation
of #2654.
MKVToolNix GUI: update check: the dialog showing the latest news & version
information states explicitly where the links take the user (the MKVToolNix
NEWS.md` file and YouTube respectively).
Bug fixes:
mkvmerge: Matroska reader: mkvmerge did not copy the codec's private data
when reading WavPack from Matroska files. Fixes #2685.
mkvmerge: MPLS handling: re-added caching when using MPLS playlists as input
files. Fixes #2666.
mkvmerge: MPEG TS reader: when reading an MPLS playlist, the calculation of
the minimum timestamp to use for shifting all output timestamps to zero was
wrong. It was wrongfully considering timestamps from packets it would not
copy due to the MPLS's timestamp restrictions. This could lead to the first
timestamps in the output file being quite large, e.g. more than a couple of
minutes, causing sync problems when multiplexing together with other
files. Fixes #2670.
MKVToolNix GUI: multiplexer: the automatic switch between aspect ratio &
display width/height wasn't reflected in the configuration generated for
mkvmerge`. The user had to change between the two settings manually. Fixes
2660.
MKVToolNix GUI: multiplexer: the progress dialog shown when scanning a
Blu-ray wasn't closed properly in certain situations. Fixes #2678.
MKVToolNix GUI: general: the configured font was not applied to a lot of
controls (e.g. the file & track lists or the menu entries) on application
startup. Instead the user had to open & close the preferences in order for
the font to be applied to all controls. Fixes #2671.

New in MKVToolnix 40.0.0 (Nov 9, 2019)

New in MKVToolnix 39.0.0 (Nov 5, 2019)

New features and enhancements:
mkvmerge: Blu-ray: when reading an MPLS playlist mkvmerge will look up and use chapter names from the Blu-ray's "track/chapter names" meta data if it exists. Part of the implementation of 2486.
mkvmerge: MP4 reader: if present, cover art images (the `meta.udta.ilist.covr` atom) will be converted into attachments.
MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the disc library meta data will be parsed, and the biggest thumbnail, if present, will be added as a new attachment with name `cover.jpg` (extension depends on thumbnail's extension). Implements #2644.
MKVToolNix GUI: multiplexer: when adding a playlist from a Blu-ray disc, the title from the disc library meta data will be set as the new file title if the disc library meta data contains one & no title has been set yet.
MKVToolNix GUI: multiplexer: the automatically generated destination file name will now be based on the file title if one is set at that point. This works in conjunction with the title being said from the Blu-ray disc library meta data.
MKVToolNix GUI: chapter editor: when reading chapters from an MPLS playlist the GUI will look up and use chapter names from the Blu-ray's "track/chapter names" meta data if it exists. Part of the implementation of 2486.
MKVToolNix GUI: Windows: added a dark mode that's enabled when Windows 10's dark mode is turned on.
translations: added a Bulgarian translation of the programs & the man pages by Симеон Цветков (see `AUTHORS`).
Bug fixes:
mkvmerge: attachments without a file name won't be ignored anymore. Part of the fix of #2642.
MKVToolNix GUI: header editor: attachments with an empty name element will be shown as `<unnamed>` as originally intended. Part of the fix of #2642.
Linux AppImage: the AppImage will no longer change directories before running the desired executable allow the use of relative file names. Fixes #2632.
Build system changes:
MKVToolNix now requires a C++ compiler that supports the following features of the C++17 standard: "`[[maybe_unused]]` attribute", "nested namespace definition", "structured bindings". For the GNU Compiler Collection (gcc) this means v7 or newer; for clang it means v4 or newer.
Boost 1.60.0 or newer is now required.

New in MKVToolnix 38.0.0 (Oct 7, 2019)

New in MKVToolnix 37.0.0 (Aug 24, 2019)

New in MKVToolnix 36.0.0 (Aug 10, 2019)

New in MKVToolnix 35.0.0 (Jun 22, 2019)

New in MKVToolnix 34.0.0 (May 18, 2019)

New in MKVToolnix 33.1.0 (Apr 15, 2019)

New in MKVToolnix 33.0.0 (Apr 12, 2019)

New in MKVToolnix 32.0.0 (Mar 12, 2019)

New in MKVToolnix 31.0.0 (Feb 9, 2019)

New features and enhancements:
all programs: added a new option `--abort-on-warnings` that will cause the program to abort after it has emitted the first warning, similar to how it aborts after the first error. Implements #2493.
mkvmerge, mkvextract: when closing files that were opened for writing, cached data will not be flushed to storage automatically anymore. This reverts the workaround implemented for #2469. A new option was added to both programs (`--flush-on-close`) that re-enables flushing for people who are affected by data loss such as described in #2469.
The reason is that automatic flushing causes long delays in processing queues when the output by mkvmerge/mkvextract isn't the final product but just an intermediate result to be processed further. Implements #2480.
MKVToolNix GUI: multiplexer: the dialog previewing different character sets for text subtitles will now keep the position of the displayed text when switching between character sets. Implements #2489.
Bug fixes:
mkvmerge: AVI reader: using DV type 1 AVIs will now result in an unsupported file type being reported (as the underlying AVI library doesn't support them) instead of crashing mkvmerge. Fixes #2491.
mkvmerge: HEVC: the height of interlaced streams will now be set correctly to the height of the full frame instead of the height of a single interlaced field. Fixes #2446.
mkvmerge: MP4 reader: edit lists consisting solely of elements that mkvmerge doesn't support (such as dwells) are simply ignored. Before no data was read for such tracks at all. Fixes #2487.
mkvmerge: text subtitles: entries with an explicit duration of 0ms will now be handled correctly: the 0ms duration will be stored in Matroska instead of the difference between the current and the following entry. Fixes #2490.
MKVToolNix GUI: multiplexer, chapter editor: fixed drag & drop handling with Qt 5.12.0 and newer. Fixes #2472.
MKVToolNix GUI: multiplexer: the GUI did not clean up temporary files created when running `mkvmerge`. Fixes #2499.
Build system changes:
Qt 5.4.0 or newer has required (up from 5.3.0) since version 30.0.0; I just forgot to include this entry.

New in MKVToolnix 30.1.0 (Jan 6, 2019)

New in MKVToolnix 30.0.0 (Jan 4, 2019)

New in MKVToolnix 29.0.0 (Dec 2, 2018)

Important notes:
The string formatting library used was switched from `boost::format` to
[`fmt`](http://fmtlib.net/). See the section "Build system changes" for
details.
New features and enhancements:
MKVToolNix GUI: added an option in the preferences for disabling automatic
scaling for high DPI displays. Implements #2415.
MKVToolNix GUI: the GUI will now prevent the system from going to sleep
while the job queue is running. This feature is implemented for macOS,
Windows and Linux/Unix systems where the `org.freedesktop.login1.Manager`
D-Bus interface is available. Implements #2411.
Bug fixes:
Mkvmerge: chapter generation: the start timestamps of chapters generated in
intervals was wrong for files whose smallest video timestamp was bigger than
0. Fixes #2432.
Mkvmerge: MP4 reader: fixed handling of atoms whose size exceeds the parent
atom's size. Fixes #2431.
Mkvmerge, MKVToolNix GUI's chapter editor: the chapter name template will
now also be used when reading Ogg-style chapter files with empty chapter
names. Fixes #2441.
Mkvextract: AAC: mkvextract will now write the program config element (PCE)
before the first AAC raw data packet if the PCE is present in the
`AudioSpecificConfig` structure in the `Codec Private` Matroska element. The
PCE carries vital information about the number of channels and is required
in certain cases. Fixes #2205 and #2433.
Mkvpropedit, MKVToolNix GUI's header editor: in situations when a one-byte
space must be covered by a new EBML void element the following element must
be moved up instead. If that moved element is a cluster, the corresponding
cue entries will now be updated to reflect the cluster's new position. Fixes
#2408.
MKVToolNix GUI: Windows: the application manifest is now included properly
so that Windows actually recognizes it. See #2415.
Build system changes:
Qt's D-Bus implementation is now required for building on systems other than
macOS and Windows,
The `boost::format` library is not used anymore.
The [`fmt` library](http://fmtlib.net/) is now required. Versions 3 and
newer are supported. As not all Linux distributions include packages for the
library, its release 5.2.1 comes bundled with MKVToolNix. The `configure`
script will check for a system version of the library and use it if present
and recent enough. Otherwise it will fall back to the bundled version and
link that statically.

New in MKVToolnix 28.2.0 (Oct 26, 2018)

New in MKVToolnix 28.1.0 (Oct 24, 2018)

New in MKVToolnix 28.0.0 (Oct 22, 2018)

New in MKVToolnix 27.0.0 (Sep 27, 2018)

New in MKVToolnix 26.0.0 (Aug 26, 2018)

New features and enhancements
mkvmerge: chapter generation: if the name template given by `--generate-chapters-name-template` is empty, no names (`ChapterDisplay`master elements with `ChapterString`/`ChapterLanguage` children) will be generated for the chapter atoms. Part of the implementation of #2275.
mkvmerge: chapters: chapter names generated from MPLS files will now use the name template if one is set via `--generate-chapters-name-template`. Part of the implementation of #2275.
mkvmerge: mkvmerge will no longer abort with an error message if no audio, video and subtitle tracks should be multiplexed. This allows copying of chapters from non-chapter source files (e.g. Matroska or MP4 files).
MKVToolNix GUI: the font size in the tool selector on the left will scale with the font size the user selects in the preferences.
MKVToolNix GUI: the GUI will no longer automatically resize the columns in tree and list views to match the content size. Instead it remembers and restores the widths set by the user. Implements #2353.
MKVToolNix GUI: multiplexer: the chapter name template will now be set automatically to the name template in the preferences' "chapter editor" section. Additionally the option `--generate-chapters-name-template …` will be passed to mkvmerge in situations when mkvmerge will generate chapters (either because automatic generation is enabled or if chapters are generated for MPLS playlists). Part of the implementation of #2275.
MKVToolNix GUI: chapter editor: if the chapter name template is empty, chapters will be generated without names. Part of the implementation of #2275.
MKVToolNix GUI: chapter editor: added an option to remove all chapter names to the "additional modifications" dialog. Part of the implementation of #2275.
Bug fixes:
mkvmerge: Matroska reader: fixed wrong timestamps when appending Matroska files where the second Matroska file's first timestamp is bigger than 0. Fixes #2345.
mkvmerge: MP4 reader: fixed division by zero errors during file identification if the timescale is 0 in the `MVHD` atom.
mkvmerge: Windows Television DVR files are now recognized as an unsupported file type. This prevents mis-detection as MPEG-2 with an accompanying flood of error messages. Fixes #2347.
MKVToolNix GUI: info tool: under certain circumstances "cues" were shown at the wrong level (inside the previous master element instead of on level 1). Fixes #2361.
MKVToolNix GUI: job queue: fixed invalid memory handling and consequent crashes when using the "edit in corresponding tool & remove from job queue" option if one of the files in that job contained attached files. Fixes #2368.
Build system changes:
An AppStream metadata file will be installed in `$prefix/share/metainfo`.

New in MKVToolnix 25.0.0 (Jul 13, 2018)

New in MKVToolnix 24.0.0 (Jun 10, 2018)

New features and enhancements:
mkvmerge: MP4 reader: improved the detection of edit lists consisting of two identical entries, each spanning the file's duration as given in the movie header atom. The second entry is ignored in such cases. See #2306.
mkvmerge: JSON identification: the "display unit" video track property is now reported as `display_unit`. The JSON schema has been bumped to v11 for this change.
mkvmerge, mkvextract: AVC/h.264: empty NALUs will now be removed.
mkvextract: VobSub extraction: empty SPU packets will now be dropped during extraction as other tools such as MP4Box cannot handle them correctly. Implements #2293.
Bug fixes:
mkvmerge: E-AC-3 parser: fixed determining the number of channels for streams that contain an AC-3 core with dependent E-AC-3 frames. Fixes #2283.
mkvmerge: Matroska reader: fixed mkvmerge buffering the whole file if a video track is multiplexed that consists of only one or a few frames. Fixes #2304.
mkvmerge: the "display unit" video track property will now be kept if it is set in the source file. Fixes #2317.
MKVToolNix GUI: multiplexer: when scanning playlists, all playlists were offered for selection regardless of the value of the "minimum playlist duration" setting. Fixes #2299.
MKVToolNix GUI: multiplexer: deriving track languages from file names: the regular sub-expressions for ISO 639-1 codes could match on empty strings, too, causing matches in wrong places and hence no language being recognized in certain situations. Fixes #2298.
MKVToolNix GUI: header editor: fixed a crash when saving the file fails (e.g. because it isn't writable). Fixes #2319.
MKVToolNix GUI: header editor: the editor was wrongfully claiming that mandatory elements with default values cannot be removed in the "status" text. Fixes #2320.
MKVToolNix GUI: preferences: on macOS & Linux the setting "enable copying tracks by their type" wasn't restored on program start. Fixes #2297.
Other changes:
Niels Lohmann's JSON library: the bundled version has been updated from v1.1.0 (git revision 54d3cab) to v3.1.1 (git revision g183390c1).
pugixml library: the bundled version has been updated from v1.8 to v1.9 (git revision e584ea3).

New in MKVToolnix 23.0.0 (May 2, 2018)

New features and enhancements:
mkvmerge: input: format detection uses file-extension to improve performance and to give preference when several formats match.
mkvmerge: AV1: added support for reading AV1 video from Open Bitstream Unit files.
mkvmerge: AV1: adjusted the code for the AV1 bitstream format changes made up to 2018-05-02 (git revision d14e878).
mkvmerge: MP4 reader: if a track has an edit list with two identical entries, each spanning the file’s duration as given in the movie header atom, then the second entry will now be ignored. Improves the handling of files with bogus data; see #2196 and #2270.
MKVToolNix GUI: multiplexer: added options to only enable tracks of certain types by default. Implements #2271.
MKVToolNix GUI: multiplexer: added an option to enable dialog normalization gain removal by default for all audio tracks for which the operation is supported. Implements #2272.
MKVToolNix GUI: multiplexer: when deriving track languages from the file names is active and the file name contains the usual season/episode pattern e.g. "S02E14"), then only the part after the season/episode pattern will be used for detecting the language. Part of the improvements for #2267.
MKVToolNix GUI: multiplexer: the regular expression used for deriving track languages from the file names can now be customized in the preferences. Part of the improvements for #2267.
MKVToolNix GUI: multiplexer: the user can now customize the list of track languages the GUI recognizes in file names. This list defaults to a handful of common languages instead of the full list of supported languages. Part of the improvements for #2267.
Bug fixes:
mkvmerge: MP3 packetizer: removed a memory leak growing linearly with the track’s size.
mkvmerge: VobSub packetizer: whenever a VobSub packet doesn’t contain a duration on the container level, mkvmerge will now set it from the duration in the SPU packets. Before it was accidentally setting the SPU-level duration to 0 instead. Fixes #2260.
mkvmerge: track statistics tags: if writing the Date element is deactivated via --no-date, the _STATISTICS_WRITING_DATE_UTC isn’t written either anymore. Fixes #2286.
mkvmerge, mkvextract, mkvpropedit: removed several small, constant-size memory leaks.
mkvextract: fixed a crash when mkvextract with a non-Matroska file as the source file. Fixes #2281.
MKVToolNix GUI: the central area is now scrollable, allowing the GUI to be resized to almost arbitrary sizes. Fixes #2265.
MKVToolNix GUI: multiplexer: the "copy file title to destination file name" functionality will now replace everything in the destination file name up to the last period instead of only up to the first period. Fixes #2276.
Build system changes:
build system: MKVToolNix now requires a compiler that supports the following features of the C++14 standard: "user-defined literals for std::string". For the GNU Compiler Collection (gcc) this means v5.x or newer; for clang it means v3.4 or newer.
Windows: linking against and installing shared version of the libraries with MXE is now supported by setting configure‘s host triplet accordingly, e.g. --host=x86_64-w64-mingw32.shared.
Other changes:
mkvmerge: AV1: support for AV1 must be activated manually by adding engage enable_av1 as the AV1 bitstream specification hasn’t been finalized yet.

New in MKVToolnix 22.0.0 (Apr 2, 2018)

New in MKVToolnix 21.0.0 (Feb 24, 2018)

New features and enhancements
mkvmerge: track statistics tags: the `TagDefault` element will not be
written anymore as it was always set to the default value `1`
anyway. Implements #2202.
mkvmerge, MKVToolNix GUI: JSON files can now contain C++-style line comments
outside of strings (e.g. something like this: `// this is ignored`). Such
comments, even though not part of the official JSON specifications, are now
ignored when reading JSON files.
MKVToolNix GUI: chapter editor: opening a Matroska file without chapters in
it will now open the file in an empty chapter editor instead of showing an
error message. Implements #2218.
MKVToolNix GUI: an "info" tool has been added, replacing the functionality
of mkvinfo's GUI. The functionality is not on par yet but will be for
release v22. Implements most of the functionality of #2104.
## Bug fixes
build system: `configure` was treating `--disable-ubsan` and
`--disable-addrsan` the same as `--enable-ubsan` and
`--enable-addrsan`. Fixes #2199.
build system: an error message is output if a command to execute is not
found instead of silently failing.
build system: in addition to looking for the `gettext` C function and
library, `configure` now also verifies the presence of the `msgfmt` program
instead of simply relying on it.
mkvmerge: appending files with additional parts at the same time was broken
if more than one additional part was appended (e.g. when appending files
from DVDs with something like `'(' VTS_01_1.VOB VTS_01_2.VOB ')' + '('
VTS_02_1.VOB VTS_02_2.VOB ')'`). In such a situation the content from files
`VTS_02_1.VOB` and `VTS_02_2.VOB` where laid out in parallel to the content
from the earlier files.
mkvmerge: FLV reader: a single invalid AAC frame was written for AAC audio
tracks with codec initialization data longer than five bytes.
mkvmerge: FLV reader: timestamps will be normalized down to 0. Fixes #2220.
mkvmerge: MP4 reader: if an AAC track doesn't contain an AAC-specific
decoder configuration in the ESDS portion, then a default decoder
configuration will be generated based on the track's header data instead of
skipping the track. Fixes #2221.
mkvmerge: MP4 reader: fixed reading HEVC/h.265 video tracks if they're
stored as Annex B byte streams inside MP4. Fixes #2215.
mkvmerge: Ogg Opus reader: mkvmerge will now emit a warning instead of
aborting when it encounters an Ogg Opus page with no data in the
packet. Fixes #2217.
mkvmerge, mkvextract: Matroska parser: fixed a segmentation fault that
occurred whenever the first level 1 element after resyncing after an error
in the file structure isn't a cluster. Fixes #2211.
mkvmerge, MKVToolNix GUI multiplexer & header editor: fixed a crash during
file type detection for attachments if MKVToolNix is installed in a path
with non-ASCII characters (e.g. German Umlauts). Fixes #2212.
mkvinfo: the `--hex-positions` parameter did nothing in summary mode.
mkvinfo: Windows: line endings will be written as `rn` (carriage return &
line feed) again instead of just `n` (line feed).
mkvpropedit: adding track statistics tags: for tracks with content encoding
(compression) mkvpropedit is now accounting the uncompressed number of
bytes, not the encoded (compressed) number of bytes. Fixes #2200.
MKVToolNix GUI: multiplexer: the subtitle character set can now be set for
appended subtitle files, too. Fixes #2214.
MKVToolNix GUI: multiplexer: when appending, all tracks appended to disabled
tracks will start out disabled, too.
## Build system changes
mkvinfo: the GUI portion has been removed. mkvinfo is now a pure
command-line program again.

New in MKVToolnix 20.0.0 (Jan 15, 2018)

Feature removal: several deprecated features have been removed:
mkvmerge: the deprecated options `--identify-verbose` (and its counterpart I`), `--identify-for-gui`, `--identify-for-mmg` and identification-format verbose-text`
all command line tools: support for the deprecated, old, proprietary format used for option files
all command line tools: support for passing command line options via the deprecated environment variables `MKVTOOLNIX_OPTIONS`, `MKVEXTRACT_OPTIONS`, MKVINFO_OPTIONS`, `MKVMERGE_OPTIONS` and `MKVPROPEDIT_OPTIONS`
mkvinfo: most of its code was re-written in order to lay the groundwork for including its functionality in MKVToolNix GUI but with more features than the existing mkvinfo GUI. The result is that a lot of its output has been
changed slightly while keeping the basic layout. Changes include but aren't limited to:
Several element names are a bit clearer (e.g. `Maximum cache` instead of MaxCache`).
All timestamps and durations are now output as nanoseconds in formatted form (e.g. `01:23:45.67890123`). All additional formats (e.g. floating point numbers output in seconds or milliseconds) were removed.
Element names for chapters and tags are now translated if a translation is available.
Elements located in wrong positions within the Matroska document are handled better.
While mkvinfo's output is mostly kept very stable, it is not designed to be parsed by other utilities. Even though I've tried hard to cram all changes and cleanups into this version, additional changes may be made in the next couple of releases depending on user feedback and bug reports.
New features and enhancements:
mkvmerge: AVC/h.264 packetizer (framed): access unit delimiter NALUs will now be removed. Implements #2173.
Bug fixes:
mkvmerge: AVC/h.264 parser: when fixing the bitstream timing information
mkvmerge will now use exact representations of the desired field duration if possible. For example, when indicating 50 fields/second `num_units_in_tick` is set to 1 and `time_scale` to 50 instead of 5368709 and 268435456. Part of the fix for #1673.
mkvmerge: AVC/h.264 parser: mkvmerge no longer assumes that encountering sequence parameter set or picture parameter set NALUs signal the start of a new frame. Fixes #2179.
mkvmerge: AVC/h.264 packetizer (framed): when mkvmerge is told to fix the bitstream timing information, it will now update all SPS NALUs, not just the ones in the AVCC. Part of the fix for #1673.
mkvmerge: MPEG TS reader: TS packet payloads will only be treated as PES packets if the payload actually starts with a PES start code. The prior behavior led to wrong timestamps and potentially broken frame data. Fixes 2193.
mkvmerge: MPEG TS reader: mkvmerge will now drop incomplete PES packets as soon as an error is detected in the transport stream instead of passing the incomplete frame to the packetizer. An error is assumed either if the transport_error_indicator` flag is set or if the value of the continuity_counter` header field doesn't match the expected value. Fixes 2181.
mkvmerge: Opus: when re-muxing Opus from Matroska mkvmerge will now write "block duration" elements for all block groups where a "discard padding" is set, too. Fixes #2188.
mkvmerge: SRT reader: mkvmerge can now handle SRT files with timestamps without decimal places (e.g. `00:01:15` instead of `00:01:15.000`).
mkvmerge: read buffer I/O class: the class could get out of sync regarding the file position of the underlying file I/O class causing wrong data to be returned on subsequent read operations. One result was that trying to identifying MPLS files that refer to very short M2TS files caused mkvmerge to segfault.
mkvmerge: multiplexer core: if there's a gap in audio timestamps, a new block group/lace will be started for the first frame after each gap. Before
the fix the frame after the gap was often stored in the previous block group causing the gap to be in the wrong place: at the end of that block group. Fixes #1700.
mkvextract: AVC/h.264: if two consecutive IDR frames with the same idr_pic_id` parameter and no access unit delimiters are found between them,
mkvextract will insert an access unit delimiter in order to signal the start of a new access unit. Fixes #1704.
MKVToolNix GUI: update check dialog: Markdown links will now be converted to clickable links. Fixes #2176.
build system: fixed a race condition when creating new directories if `rake` is run with `-jN` in newer versions of Ruby/`rake`. Fixes #2194.
Build system changes:
[cmark] the CommonMark parsing and rendering library in C, is now required when building the GUIs.

New in MKVToolnix 19.0.0 (Dec 17, 2017)

Important notes:
The MKVToolNix project now contains a Code of Conduct](https://mkvtoolnix.download/doc/CODE_OF_CONDUCT.md).
The MKVToolNix project's source code repository, bug tracker and wiki have been moved to [GitLab](https://gitlab.com/mbunkus/mkvtoolnix/).
New features and enhancements:
mkvmerge: splitting by duration, by timestamps or by timestamp-based parts:
mkvmerge will now consider the first key frame within 1ms of the requested value to be eligible for splitting.
MKVToolNix GUI: the GUI will now save and restore the widths of columns in tree and list views. Implements #2057.
MKVToolNix GUI: header editor: when closing or reloading a modified file, the GUI will now focus the first element that's been modified before asking the user for confirmation regarding discarding unsaved changes.
Bug fixes:
mkvmerge: fixed reading text files encoded in UTF-16 order UTF-32 that have different forms of line endings (new lines, carriage returns or a mix of both). Fixes #2160.
mkvmerge: MP4 reader: fixed mkvmerge's interpretation of edit list entries with `segment_duration == 0` when there's more than one edit list entry. In that case mkvmerge was reading the whole content more than once. Fixes 2152.
mkvmerge, GUI's multiplexer: MIME types: added the `font` top-level media types from RFC 8081. This means that the following new MIME types for fonts can be used: `font/ttf`, `font/otf`, `font/woff` and `font/woff2`.
mkvmerge: MPEG transport stream reader: fixed slow speed on Windows due to lack of buffering.
mkvextract: fixed slow track extraction speed on Windows due to lack of buffering. Fixes #2166.
MKVToolNix GUI: multiplexer: changing the "subtitle/chapter character set" drop-down was ignored when the selected track was a chapter track. Fixes 2165.
MKVToolNix GUI: multiplexer: once a "subtitle/chapter character set" was set for a track it couldn't be changed back to the empty entry (=auto-detection) anymore.
MKVToolNix GUI: header editor: fixed re-translating several displayed strings when the GUI language is changed if the language the GUI was started with was not English. Fixes #2159.
MKVToolNix GUI: header editor: whenever a file did not contain a "date" element in its segment information section, the GUI would erroneously ask the user to confirm discarding unsaved changes when closing or reloading the tab. Fixes #2167.
MKVToolNix GUI: job queue: jobs are now saved when their status changes in addition to when the program exits. Fixes #2168.

New in MKVToolnix 18.0.0 (Nov 18, 2017)

New features and enhancement:
build system: when building with clang v3.8.0 or newer, `configure` will no
longer restrict optimization flags to `-O1` and use `-O3` again (older
versions of clang suffered from excessive memory usage with higher
optimization levels).
build system: when building with mingw 7.2.0 or newer, `configure` will no
longer restrict optimization flags to `-O2` and use `-O3` again (older
versions of mingw suffered from bugs such as segmentation faults with higher
optimization levels).
build system: stack protection is enabled when building with clang 3.5.0 or
newer on all platforms.
mkvmerge: AVC & HEVC ES parsers: performance improvements by copying much
less memory around.
mkvmerge: tags: reintroduced a workaround for non-compliant files with tags
that do not contain the mandatory `SimpleTag` element. This workaround was
removed during code refactoring in release v15.0.0.
GUI: multiplexer: the "AAC is SBR/HE-AAC/AAC+" checkbox in the "audio
properties" section will be disabled if the functionality is not implemented
for the selected track's codec & container.
GUI: multiplexer: the "reduce to core" checkbox in the "audio properties"
section will be disabled if the functionality is not implemented for the
selected track's codec. See #2134.
Bug fixes:
mkvmerge: AAC ADTS parser: fixed interpretation of the
`channel_configuration` header element for ADTS files that do not contain a
program configuration element: value 7 means 7.1 channels. Fixes #2151.
mkvmerge: Matroska identification: the `date_local` and `date_utc`
attributes will only be output if the identified Matroska file actually
contains the "date" header field.
mkvmerge: WebVTT: mkvmerge did not recognize timestamp lines if the hours
components were absent. Fixes #2139.
mkvpropedit, GUI's header editor: the `date` header field won't be added
automatically anymore whenever the segment info section is edited and the
`date` element is either deleted or not present in the first place. Fixes
#2143.

New in MKVToolnix 17.0.0 (Oct 15, 2017)

Important notes:
The word "timecode" has been changed to "timestamp" everywhere it was used in MKVToolNix. This affects program output (including mkvinfo's), GUI controls, command line parameters (e.g. `mkvmerge --timestamp-scale …`) and file formats. All programs remain backwards compatible insofar as they still accept "timecode" in all those places (e.g. `mkvmerge --timecode-scale …`).
The reason for the change is wrong usage. What both the Matroska specification and MKVToolNix used "timecode" for is normally called a "timestamp" in audio & video domains. A "timecode" on the other hand has a specific meaning. As the Matroska specification is moving towards implementing real timecodes, it will also move towards correcting the verbiage. MKVToolNix is following this change.
mkvextract's command line interface has been changed to allow extraction of multiple items at the same time. The first argument must now be the source file's name. All following arguments either set the mode (e.g. `tracks`) or specify what to extract in the currently active mode.
Those items that were written to the standard output (chapters, tags and cue sheets) are now always written to files instead. Therefore the respective modes require an output file name.
For example, extracting two tracks, the chapters and the tags can be done with the following command:
`mkvextract input.mkv tracks 0:video.h265 1:audio.aac chapters chapters.xml tags tags.xml`
The old interface (specifying the mode first and the source file name second) remains working and supported. However, it is now deprecated and will be removed at the end of 2018.
New features and enhancements:
mkvmerge: AC-3: during identification regular AC-3 and E-AC-3 tracks will now be identified differently for most container formats (exception: AVI, Real Media, Ogg/OGM). The codec will be reported as `AC-3` for regular AC-3 and as `E-AC-3` for E-AC-3 tracks instead of the combined `AC-3/E-AC-3`.
mkvextract: the command line interface has been changed to allow extraction of multiple items at the same time. See section "Important notes" for details.
Bug fixes:
mkvmerge: AAC ADTS parser: mkvmerge will now parse the `program_config_element` if it is located at the start of an AAC frame in order to determine the actual number of channels. This overrides invalid channel configurations in the ADTS headers, for example. Fixes #2107.
mkvmerge: fixed AC-3 being misdetected as encrypted MPEG program streams under certain conditions.
mkvmerge: Dirac: under certain conditions (e.g. only muxing a single Dirac track without any other tracks) mkvmerge was always setting the pixel width & height to 123. The frame rate was wrong, too.
mkvmerge: E-AC-3 in Matroska: if AC-3 cores and their corresponding E-AC-3 extension are located in two different Matroska blocks, then mkvmerge will now re-assemble them into a single block and only use the first block's timestamp.
mkvmerge: SRT reader: fixed calculating the duration of entries starting with at a negative timestamp.
mkvmerge: VC-1: under certain conditions (e.g. only muxing a single VC-1 track without any other tracks) mkvmerge was always setting the pixel width & height to 123. The frame rate was wrong, too. Fixes #2113.
mkvmerge: command line options: an error message will be output if the single-value-form of the `--sync` option is used and it isn't a number (e.g. `--sync 0:asd`). Fixes #2121.
mkvpropedit, GUI's header editor: both programs will now show proper error messages instead of crashing when certain kinds of data corruption is found when reading a file. Fixes #2115.

New in MKVToolnix 16.0.0 (Oct 1, 2017)

New features and enhancements:
mkvmerge: MP4 reader: added support for Vorbis. Implements #2093.
Bug fixes:
configure: the checks for libEBML and libMatroska have been fixed to require libEBML 1.3.5 and libMatroska 1.4.7 as intended.
mkvmerge: AAC reader: mkvmerge will now emit an error message for AAC files whose header fields imply a sampling frequency or number of channels of 0. See #2107.
mkvmerge: AVC/h.264 ES parser: fixed the calculation of reference information for P and B frames. This also fixes some P frames being marked as B frames and vice versa.
mkvmerge: AVC/h.264 ES parser: only non-key frames that have the NALU header field `nal_ref_idc` set to 0 will be marked as "discardable" in SimpleBlock` elements. Other half of the fix for #2047.
mkvmerge: HEVC/h.265: the generation of the HEVCC structure stored in CodecPrivate` was wrong in two places: 1. the position of the number of sub-layers was swapped with reserved bits and 2. the VPS/SPS/PPS/SEI lists did not start with a reserved 1 bit.
mkvmerge: output: the `doc type version` will be set at least to 2 if certain elements are written (`CodecState`, `CueCodecState`, FlagInterlaced`).
mkvmerge: output: the track header attributes `MinCache` and `MaxCache` will not be written anymore. Fixes #2079.
mkvmerge: Matroska reader: the "key" and "discardable" flags of SimpleBlock elements will be kept as they are. Partial fix for #2047.
mkvmerge: Matroska reader: if present in the file, the "white colour coordinate x" track header attribute was written to both "white colour coordinate x" and "white colour coordinate y" in the output file.
mkvmerge: Opus output: mkvmerge will now put all frames with discard padding into their own block group. Fixes #2100.
MKVToolNix GUI: header editor: removed the check for external modification when saving the file. Fixes #2097.
MKVToolNix GUI: job queue: fixed calculation of total progress when automatic removal of completed is enabled. Fixes #2105.
Build system changes:
libEBML v1.3.5 and libMatroska v1.4.8 are now required. In fact v15.0.0 already requires libEBML v1.3.5 and libMatroska v1.4.7 but did not include proper version checks for them (nor was there a NEWS.md entry for the new
libMatroska requirement). New is the requirement for libMatroska v1.4.8 due to it fixing writing block groups for tracks with the track number 128 (see 2103).

New in MKVToolnix 15.0.0 (Aug 19, 2017)

Important notes:
mkvmerge, mkvpropedit, GUI's header and chapter editors: the programs will
no longer add most missing Matroska elements that are mandatory but have a
default value in the Matroska specification (e.g. the `TagLanguage` element
with a value of `und` if it isn't present in its `SimpleTag` parent). Due to
this change libEBML v1.3.5 is now required.
New features and enhancements:
MKVToolNix GUI: multiplex tool: added a new entry to the "source files"
context menu labeled "Set destination file name from selected file's
name". It will force the GUI to consider the selected file to be the
reference for automatically setting the file name, no matter which file was
originally added as the first file. It will also force setting the
destination file name once if automatic destination file name generation is
turned off in the preferences. Implements part of #2058.
MKVToolNix GUI: multiplex tool: added an option in the preferences on
"Multiplexer" → "Output" labeled "Only use the first source file that
contains a video track". If enabled, only source files containing video
tracks will be used for setting the destination file name. Other files that
are added are ignore. Implements the rest of #2058.
MKVToolNix GUI: header editor: added support for editing the video colour
attributes. Implements the second half of #2038.
MKVToolNix GUI: header editor: added support for the "video projection"
track header attributes. Part of the implementation of #2064.
MKVToolNix GUI: job queue: selected jobs can now be move up and down by
pressing the `Ctrl+Up` and `Ctrl+Down` keys. Additionally, push buttons to
move them up & down are shown if the corresponding option is enabled in the
preferences. Implements #2060.
mkvmerge: added support for the "video projection" track header
attributes. Part of the implementation of #2064.
mkvinfo: added support for the "video projection" track header
attributes. Part of the implementation of #2064.
mkvpropedit: added support for editing the video colour
attributes. Implements one half of #2038.
mkvpropedit: added support for the "video projection" track header
attributes. Part of the implementation of #2064.
Bug fixes:
all: selecting the program's language (e.g. via the `--ui-language`
command-line option or via the GUI's preferences) did not work on Linux &
Unix if the `LANGUAGE` environment variable was set and didn't include the
desired language. Fixes #2070.
MKVToolNix GUI: removed the keyboard shortcuts for switching between the
different tools (e.g. `Ctrl+Alt+1` for the multiplexer). They overlapped
with basic functionality on keyboards that use an `AltGr` key, e.g. German
ones, where `AltGr+7` emits `{`. As `AltGr+key` is implemented as
`Ctrl+Alt+key` under the hood, this means that `AltGr+7` is really
`Ctrl+Alt+7` which the GUI now took to mean "switch to the job queue"
instead of "insert `{`". Fixes #2056.
MKVToolNix GUI: header editor: after saving the file the GUI wasn't updating
its internal file modification timestamp. That lead to the GUI wrongfully
claiming that the file had been modified externally when the user wanted to
save the file once more, requiring a reload of the file losing all
modifications made since saving the first time.
mkvmerge: DTS handling: some source files provide timestamps for audio
tracks only once every `n` audio frames. In such situations mkvmerge was
buffering too much data resulting in a single gap in the timestamps of one
frame duration after frame number `n - 1` (the second audio timestamp read
from the source file was used one output frame too early). Fixes #2071.
mkvinfo: fixed a null pointer dereference if an `EbmlBinary` element's data
pointer is a null pointer. Fixes #2072.
Build system changes:
configure: added option `--disable-update-check`. If given, the code
checking online for available updates will be disabled. The update check is
enabled and included in the GUI by default.
libEBML v1.3.5 is now required.
Other changes:
mkvmerge: the option `--colour-matrix` has been renamed to
`--colour-matrix-coefficients` in order to match the specification more
closely. The old option name will continue to be recognized as well.

New in MKVToolnix 14.0.0 (Jul 23, 2017)

New features and enhancements:
mkvmerge: AAC: implemented support for AAC with 960 samples per frame. Implements #2031.
mkvmerge: identification: if the encoding/character set of a text subtitle track is known (e.g. because a byte order mark is present in the file), then it will be output during identification as the `encoding` property. Implements mkvmerge's part of #2053.
mkvmerge: WAV reader: added support for Wave64 files. Implements #2042.
mkvmerge, mkvpropedit, MKVToolNix GUI (chapter editor): added support for chapters in WebM files that is spec-compliant by removing all tag elements not supported by the WebM spec. Implements #2002.
mkvpropedit: added support for tags in WebM files that is spec-compliant by removing all tag elements not supported by the WebM spec.
MKVToolNix GUI: multiplexer: if the encoding/character set of a subtitle track cannot be changed, the GUI will deactivate the "subtitle character set" drop-down box and ignore changes to it when multiple tracks are selected. Additionally, if the track's encoding is known and cannot be changed (e.g. due to a byte order mark in the file), that encoding will be selected in the drop down box automatically. Both changes signal to the user that she doesn't have to take care of the encoding herself. Implements the GUI's part of 2053.
MKVToolNix GUI: chapter editor: added a function to the "additional modifications" dialog for calculating and setting the end timestamps. Implements #1887.
MKVToolNix GUI: changed the shortcuts for switching between the various tools from `Alt+number` (e.g. `Alt+1` for the multiplexer tool) to Ctrl+Alt+number` in order to avoid clashing with Windows' input method for arbitrary characters (pressing and holding `Alt` and typing the codepoint on the number pad). Implements #2034.
MKVToolNix GUI: added a "Window" menu and entries with shortcuts for selecting the next (`Ctrl+F6`) respectively previous tab (`Ctrl+Shift+F6`) in the current tool. Implements #1972, #2032.
MKVToolNix GUI: on Windows the GUI will now determine the default font to use by querying Windows for the default UI/message box font instead of using the hardcoded `Segoe UI`. This might fix issues such as #2003 (unverified). translations: added a Romanian translation of the programs by Daniel (see AUTHORS).
Bug fixes:
mkvmerge: AVC/h.264 parser: fixed wrong frame order & timestamp calculation in certain situations when SPS (sequence parameter sets) or PPS (picture parameter sets) change mid-stream. Fixes #2028.
mkvmerge: HEVC/h.265 parser: fixed wrong frame order & timestamp calculation in certain situations when SPS (sequence parameter sets) or PPS (picture parameter sets) change mid-stream. This is the HEVC/h.265 equivalent of 2028.
mkvmerge: MPEG-1/-2 video: the "remove stuffing bytes" feature introduced in v5.8.0 (feature request #734) was broken. In a lot of situations it did not detect the end of a slice correctly and removed 0 bytes that were actually part of the slice structure. Often there were no visual problems as decoders were able to ignore such errors, but in other cases there are visual artifacts upon decoding. As detecting the slice end properly requires parsing the whole slice structure, this feature has been removed again. Fixes #2045.
mkvmerge: MPEG PS reader: fixed mkvmerge trying to handle an "end" code the same way as a "program stream map" code.
mkvmerge: MPEG TS reader: mkvmerge won't emit warnings if the system's iconv` library doesn't support the ISO 6937 character set. Fixes #2023.
mkvmerge: when appending fails the error message details (e.g. "the number of channels differs: 1 and 2") were often not output. Fixes #2046.
MKVToolNix GUI: multiplex tool: implemented a workaround for a crash that could occur during drag & drop if at least one of the columns is hidden. Fixes #2009.
MKVToolNix GUI: multiplex tool: appended tracks can no longer be enabled selected for multiplexing) if the track they're going to be appended to is not enabled. Fixes #2039.
MKVToolNix GUI: multiplex tool: if the GUI is set to ensure unique output file names, it will now verify that right before starting to multiplex/adding the job to the queue, too. Fixes #2052.
MKVToolNix GUI: fixed the total progress reverting to 0% instead of staying at 100% when all jobs have finished. This was introduced by the attempt at fixing the computation of the value of total progress bar for multiple jobs running. Fixes #2005. configure: fixed DocBook detection if `/bin/sh` is `dash`.
Build system changes:
Boost: the minimum required version has been bumped to 1.49.0. Earlier releases fail to build on my current systems and will therefore not be supported anymore. configure: when looking for the "nlohnmann JSON" include files configure will now try the path "nlohmann/json.hpp" first, "json.hpp" second (only "json.hpp" was tried before). If neither is found, the copy included in the MKVToolNix sources will be used. Fixes #2048.

New in MKVToolnix 13.0.0 (Jun 26, 2017)

New features and enhancements:
mkvmerge: MPEG TS reader: information about multiple programs will be output
as container properties during verbose/JSON identification. See #1990 for
the use case.
MKVToolNix GUI: multiplex tool: added a column "program" to the tracks
list. Certain container types such as MPEG transport streams can contain
multiple programs. The new column will contain the service name (think TV
station names such as "arte HD") for such streams. Implements the GUI part
of #1990.
MKVToolNix GUI: multiplex tool: the dialog asking the user what to do with
dropped files (add to current settings, add to new settings etc.) now
remembers the previous decision and defaults to it the next time it's
shown. Implements #1997.
MKVToolNix GUI: tabs can now be closed by pressing the middle mouse
button. Implements #1998.
Bug fixes:
mkvmerge: MP4 reader: MPEG-1/2 video read from MP4 files was written with an
invalid codec ID (e.g. `V_MPEG7`) in certain cases. Fixes #1995.
mkvmerge: MPEG PS reader: made the file type detection less strict so that
garbage at the start of the file doesn't prevent detection. Fixes #2008.
mkvmerge: MPEG PS reader: (E-)AC-3 tracks were not detected if the very
first packet for that track didn't contain a full (E-)AC-3 frame. Fixes
#2016.
mkvmerge: MPEG TS reader: fixed mkvmerge not detecting all tracks in MPEG
transport streams containing multiple programs. Fixes one part of #1990.
mkvmerge: MPEG TS reader: fixed track content being broken for some tracks
read from MPEG transport streams containing multiple programs. Fixes another
part of #1990.
mkvmerge: JSON identification: the `stream_id` and `sub_stream_id` track
properties were output as hexadecimal strings instead of unsigned
integers. As the `ts_pid` track property was only used for MPEG transport
streams, its value is now output as `stream_id` instead, and the `ts_pid`
property has been removed. The JSON schema version has been bumped to 8 due
to this change.
mkvmerge: fixed a crash when appending video tracks where one track has a
CodecPrivate member and the other one doesn't.
mkvmerge: track statistics tags: the `NUMBER_OF_BYTES` tag is supposed to
contain the number of bytes in a track before any of the content encoding
schemes such as lossless compression is applied; however, mkvmerge was
wrongfully using the number of bytes after the schemes had been
applied. Fixes #2022.
mkvmerge: CLPI & MPLS parsers: MPLS and CLPI files with version number
`0300` as used on Ultra HD Blu-ray Discs are now accepted as well. Fixes
#2010.
mkvpropedit: fixed a crash when the selector used for `--tags` is invalid.
MKVToolNix GUI: fixed computation of value of total progress bar for multiple
jobs running. Fixes #2005.
MKVToolNix GUI: multiplexer, adding new attachments: when the GUI checks if
there's an attachment with the same name it will now disregard disabled
attached files. Fixes #2001.
Debian/Ubuntu packaging: during a `dpkg-buildpackage` run the test suite was
failing when a non-English locale was active and MKVToolNix packages had
already been installed. Fixes #2011.

New in MKVToolnix 12.0.0 (May 21, 2017)

New features and enhancements:
MKVToolNix GUI: the key combination Ctrl+Shift+Space will now toggle the selection of the current item in all tree views where multiple selections are allowed. Implements #1983.
MKVToolNix GUI: chapter editor: added the extension `*.cue` (for cue sheet files) to the "open chapter file" dialog.
mkvmerge: cue sheet parser: if the cue sheet contains a non-empty `TITLE`
entry and if no other segment title has been set yet, then the segment title will be set to the cue sheet's `TITLE` value. Implements #1977.
mkvmerge, MKVToolNix GUI (multiplexer): added an option `--no-date` that
prevents the "date" field from being written to the segment information headers. Implements one half of #1964.
mkvpropedit, MKVToolNix GUI: header editor: added support for editing the
"date" segment information field. Implements the other half of #1964.
Bug fixes:
MKVToolNix GUI: preferences ? job actions, type "play audio file": the GUI will no longer clear the audio file name input if the user aborts the audio
file selection dialog.
MKVToolNix GUI: preferences ? job actions, type "play audio file", on Windows: the default "play audio" action was pointing to the wrong directory. Existing configurations with such a wrong path will be fixed automatically upon starting the GUI. Fixes #1956.
mkvmerge: HEVC/h.265 parser: fixed the superfluous copying of the `bitstream_restriction_flag` and its dependent flags in the VUI parameters
of the sequence parameter sets if the timing information is present, too. This fixes #1924 properly, and it also fixes #1958.
mkvmerge: MPEG TS reader, AAC parser: the MPEG TS reader will now force the AAC parser to use the multiplex mode that the MPEG TS reader has detected (e.g. LOAS/LATM). This prevents the AAC packetizer from mis-detecting it in its own attempt to identify the mode. Fixes #1957.
mkvmerge: MPEG TS reader: valid MPEG transport streams that start with an
h.264/h.265 start code (e.g. a file created by cutting at an arbitrary
position) were not recognized as a supported file type.
mkvmerge: MPEG TS reader: fixed a potential read access from invalid memory
addresses in the code parsing the program map table (PMT).
mkvmerge: MPEG TS reader: if packets are encountered that belong to a PID
not listed in the program map table (PMT), mkvmerge will attempt to
determine their type and codec from the content. This supported content
types are AAC (ADTS only) and AC-3. Fixes #1980.
mkvmerge: MP4 reader: fixed finding and parsing the `colr` atom if there are
more than one video extension atoms and the `colr` atom is not the first
one.
mkvmerge: MP4 reader: the `nclx` colour type of the `colr` atom is now
recognized, too (as defined by ISO/IEC 14496-12, "ISO base media format").
configure: fixed configure aborting if a `moc`, `uic`, `rcc` or `qmake`
binary is found, but the binary's version is too old. Fixes #1979.

New in MKVToolnix 11.0.0 (Apr 23, 2017)

New features and enhancements:
mkvmerge: FLAC reader: added support for handling embedded pictures as
attachments. Implements #1942.
mkvmerge: MP4 reader: merged pull request #1804 adding support for parsing
the "COLR" atom and including its values as track headers.
MKVToolNi GUI: watch jobs: the user can now have the GUI eecute an action
once as soon as the current job or the whole queue finishes. The actions are
the same ones that can be configured to be run automatically after job or
queue completion.
MKVToolNi GUI: implemented several built-in actions that can be eecuted
either on special events or once via the "watch jobs" tool. These are:
playing an audio file (implemented for all operating systems); hibernating,
sleeping and shutting down the computer (only implemented for Windows and
for Linu systems using systemd).
MKVToolNi GUI: multiple tool: added a new option for what to do after
starting to multiple/adding to the job queue: "close current settings" will
close the current multiple settings without opening new ones.
Bug files:
mkvmerge: AAC parser: fied mis-detection of certain data as valid ADTS AAC
headers resulting in memory allocation failures. Fies #1941.
mkvmerge: AVC/h.264 parser: mkvmerge will now ignore bogus timing
information in the sequence parameter sets (values indicating more than
100000 progressive frames per second). Fies #1946.
mkvmerge: AVC/h.264 & HEVC/h.265 parsers: all trailing zero bytes will now
be removed from NALUs. Fies #1952.
mkvmerge: HEVC/h.265 parser: fied copying the `bitstream_restriction_flag`
and all dependent fields in the VUI parameters of the sequence parameter
sets. Fies #1924.
mkvmerge: HEVC/h.265 parser: fied the calculation of the number of
parameter set arrays in the HEVCC data structure stored in
CodecPrivate. Fies the video-related part of #1938.
mkvmerge: HEVC/h.265 parser: fied writing superfluous and uninitialized
bytes at the end of the HEVCC data structure stored in CodecPrivate. Another
fi for the video-related part of #1938.
mkvmerge: HEVC/h.265 parser: fied the assumption that the HEVCC data
structure always includes arrays for all parameter set types (VPS, SPS, PPS
and SEI), and that the order is always VPS ? SPS ? PPS ? SEI. Instead now
only the arrays actually present are parsed, and they can be in any order.
This fies mkvinfo's output for Matroska files created from files such as
the one from #1938.
mkvmerge: AVC/h.264 packetizer: when reading a framed track (e.g. from
Matroska or MP4 files), specifying a default duration as fields (e.g. `50i`)
would result in double the actual duration for each frame and the track's
default duration header field. Fies #1916.
mkvmerge: Matroska reader: invalid track language elements are now treated as
if they were set to `und` = "undetermined". See #1929 for contet.
mkvmerge: MPEG TS reader, AAC: mkvmerge will now require five consecutive
AAC headers with identical parameters before track type determination is
considered valid. This avoids false positives and consequently wrong track
parameters. Fies the audio-related part of #1938.
mkvmerge: fied an endless loop in certain circumstances when splitting by
`parts` or `parts-frames` and the start of the file is discarded. Fies
#1944.
MKVToolNi GUI: multipleer tool: the "show command line" dialog will no
longer include the mkvmerge eecutable's location as the first argument for
the two "MKVToolNi option files" escape modes. Fies #1949.
MKVToolNi GUI, header editor: empty track language elements are now treated
the same as those set to invalid ISO 639-2 codes: as if they were set to
`und` = "undetermined". See #1929 for contet.
Build system changes:
bug fi: configure now looks for the `strings` binary by using the
`AC_CHECK_TOOL()` autoconf macro. That way it will be found in multiarch
setups, too. Fies #1923.
bug fi: the environment variable USER_CFLAGS was accidentally removed
from the compiler flags in release 9.8.0. It's been re-added. Fies #1925.
The `.desktop` files have been renamed to
`org.bunkus.mkvtoolni-gui.desktop` and `org.bunkus.mkvinfo.desktop`. This
allows Wayland compositors to associate the correct icons with running
applications for e.g. task switchers. Fies #1948.
Qt's multimedia component is required for compilation of the GUIs since
version 11.

New in MKVToolnix 10.0.0 (Mar 25, 2017)

New in MKVToolnix 9.9.0 (Feb 20, 2017)

New features and enhancements:
GUI: chapter editor: added a character set selection in the preferences for
text files. If a character set is selected there, it will be used instead of
asking the user when opening text chapter files. Implements #1874.
GUI: multiplexer: added a column "character set" to the "tracks, chapters
and tags" list view showing the currently selected character set for that
track. Implements #1873.
mkvmerge: added an --engage option "all_i_slices_are_key_frames" for
treating all I slices of an h.264/AVC stream as key frames in pathological
streams that lack real key frames. Implements #1876.
GUI: running programs after jobs: added a new variable
<MTX_INSTALLATION_DIRECTORY> for the directory the MKVToolNix GUI executable
is located in.
mkvmerge: DVB subtitle tracks whose CodecPrivate data is only four bytes
long will now be fixed up to the proper five bytes by adding the subtitling
type byte.
mkvmerge: MP4 reader: "ctts" version 1 atoms are now supported.
Bug fixes:
mkvmerge: AC-3 handling: some source files provide timestamps for audio
tracks only once every n audio frames. In such situations mkvmerge was
buffering too much data resulting in a single gap in the timestamps of one
frame duration after frame number n - 1 (the second audio timestamp read
from the source file was used one output frame too early). Fixes #1864.
mkvmerge: MP4 reader: mkvmerge was only reading a small part of MP4 DASH
files where the first "moov" "mdat" atoms occur before the first "moof"
atom. This is part of the fix for #1867.
mkvmerge: MP4 reader: edit list ("edts" atoms) that are part of the "moof"
atoms used in MP4 DASH files weren't parsed. Instead the edit lists from the
main track headers inside the "moov" atom were used. This is part of the fix
for #1867.
mkvmerge: MP4 reader: when an MP4 DASH file contained both normal chunk
offset table ("stco"/"co64" atoms) in their regular "moov" atoms, a
sample-to-chunk table ("stsc" atom) whose last entry had a "samples per
chunk" count greater than 1 and DASH "trun" atoms, then mkvmerge was
calculating wrong positions the frame content. This is part of the fix for
#1867.
mkvmerge: MP4 reader: mkvmerge couldn't deal with the key frame index table
having duplicate entries. The result was that only key frames up to and
including the first duplicate entry were marked as key frames in the output
file. All other frames weren't, even though some of them were referenced
from the key frame table after the first duplicate entry. This is part of
the fix for #1867.
mkvmerge: MP4 reader: when an MP4 file contained more than one copy of the
"moov" atom (the track headers etc.), mkvmerge was parsing them all adding
tracks multiple times. Fix for #1877.
mkvmerge: MP4 reader: fixed an integer overflow during the timestamp
calculation leading to files with wrong timestamps. Such files could not be
played back properly by most players. Fixes #1883.
mkvmerge: MPEG TS reader: if the PMT lists a DVBSUB track, mkvmerge will now
recognize it without having to find a packet for it within the probed range.
mkvmerge: splitting by parts (both the "timestamps" and the "frames"
variants): fixed the calculation of track statistics tags. When calculating
the duration the skipped portions weren't taken into account leading to a
too-high duration. As a consequence the BPS tag (bits per second) was wrong,
too. Fixes #1885.
mkvmerge: reading files with DVB/HDMV TextSV subtitle tracks with invalid
CodecPrivate caused mkvmerge to abort with an error from boost::format about
the format string not having enough arguments. Fixes #1894.
mkvmerge: fixed misdetection of certain AC-3 files as MP3 files which led to
an error message that "the demultiplexer could not be initialized".
mkvmerge: fixed huge memory consumption when appending big Matroska files
with sparse tracks (e.g. forced subtitle tracks). The Matroska reader will
now queue at most 128 MB of data. Fixes #1893.
mkvmerge: MP4 reader: the timestamps of all multiplexed tracks will now be
0-based properly.
mkvmerge: MP4 reader: the DTS-to-PTS offsets given by the "ctts" atoms are
now applied for all tracks containing a "ctts" atom, not just h.264 & h.265
tracks.
Build system changes:
Up to and including release 9.8.0 the man pages and their translations came
pre-built and bundled with the source code. Those pre-built files have now
been removed and must be built during the build process. Therefore the tool
"xsltproc" and the DocBook XSL stylesheets for man pages are now required
dependencies. Additionally the tool "po4a" must be installed for the
translated man pages to be built and installed, though this is optional.
In order to facilitate finding the new requirements new options have been
added to confiure: "--with-xsltproc=prog", "--with-docbook-xsl=dir",
"--with-po4a=prog" and "--with-po4a-translate=prog.
pugixml detection will be attempted via "pkg-config" first. If that fails,
"configure" will fall back to the previous method of trying just to compile
and link a test program with the standard include and library locations.
Implements #1891.

New in MKVToolnix 9.8.0 (Jan 23, 2017)

Important notes:
build system: the included version of the "drake" build tool has been
removed. Since Ruby 2.1 rake has supported parallel builds, too. The
MKVToolNix build system has been adjusted to enable parallel builds by
default.
New features and enhancements:
mkvmerge: VobSub in Matroska: mkvmerge will now create and use a default
index for VobSub tracks read from Matroska files that are missing their
CodecPrivate element (which normally contains said index). Implements #1854.
GUI: added checks for several common problems with the installation. These
checks will be executed when the GUI starts, and any problems will be
reported to the user.
mkvmerge: added the ISO 639-2 language codes "qaa" and "qad" (both are
titled "reserved for local use") as both are used often in France. See #1848
for more information.
mkvmerge: the JSON identification result now includes a track's codec delay
if set (only for Matroska source files). The JSON schema version has been
bumped to 6.
mkvmerge: MPEG TS: added a workaround for files where the subtitle packets
are multiplexed properly, but where their timestamps are way off from the
audio and video timestamps. Implements #1841.
mkvmerge: added support for Digital Video Broadcasting (DVB) subtitles
(CodecID `S_DVBSUB`). They can be read from MPEG transport streams and from
Matroska files. Implements #1843.
Bug fixes:
mkvmerge: MP4 reader: when an MP4 file contained fewer entries for
timestamps than frames (which they never should), mkvmerge would use 0 as
the timestamp for all the other frames. This resulted in effects such as the
last frame of an output file having a timestamp of 0 and in split files
having a much longer duration than they should have. Fixes #1847.
GUI: the cache cleanup process that's run automatically when the GUI starts
no longer blocks file identification until it is finished. Additionally the
process will only be run once per release of MKVToolNix. Fixes #1860.
GUI: certain failures during file identification that can be traced to
broken installations (e.g. mkvmerge being too old) won't be stored in the
cache anymore. Without this fix the GUI would still use the cached failed
identification result even though the underlying might have already been
fixed.
mkvmerge: fixed that the error message "not enough space on disk" was shown
twice on some operating systems. Fixes #1850.
mkvmerge, Matroska: if a codec delay is set for a track in the input file,
it is kept. Fixes #1849.
GUI: multiplexer: changing default values in the preferences (e.g. the
default track language to set) did not affect files whose identification
results had already been cached.
mkvmerge, MP4: fixed detection of MP3 audio when the object type ID in the
ESDS signals MP2 and the track headers have invalid values for number of
channels or sampling frequency. Fixes #1844.
Build system changes:
nlohman json-cpp: configure now looks for a system-wide installed version of
the nlohmann json-cpp header-only library. If one is found, it is used;
otherwise the included version will be used. Implements #1858.
If MKVToolNix is built with rake v10.0.0 or newer, its "multitask" feature
will be turned on allowing automatic parallel builds.
CURL is no longer used by MKVToolNix and is therefore not required
for building anymore.
Other changes:
GUI: the update check now uses Qt's networking classes instead of CURL.
The command line option "--check-for-updates" has been removed, even
though the deprecation warning in release 9.7.0 stated that it would
be removed in 2018.

New in MKVToolnix 9.7.1 (Dec 28, 2016)

New in MKVToolnix 9.7.0 (Dec 28, 2016)

mkvmerge: enhancement: added a new track property in JSON/verbose identification mode called "multiplexed_tracks". It's an array of track IDs that describe which of the tracks mkvmerge reports as separate ones were originally part of the same source track (e.g. TrueHD+AC-3 in a single track in MPEG transport streams). Implements #1835.
mkvmerge: added support for skipping APE(v2) tags in TTA files.
mkvextract: enhancement: added support for reporting progress in --gui-mode the same way mkvmerge does.
mkvmerge: bug fix: when using --track-order without specifying all tracks, the track numbers could end up in a way the user did not expect. Now mkvmerge will always assign track numbers for those tracks that are listed in --track-order first. The other tracks are assigned numbers afterwards. Fixes the second part of #1832.
mkvmerge: bug fix: when reading Matroska files the movie title was always taken from the first Matroska source file, even if that file didn't have a title set. Fixes one part of #1832.
all: new feature: all command line tools can now read JSON-formatted option files. Such a file's name must have an extension of ".json" (e.g. "mkvmerge @options.json"). Its content must be a valid JSON array consisting solely of JSON strings.
build system: building the GUI components of MKVToolNix now requires Qt v5.3.0 or newer.
MKVToolNix GUI: header editor & job output enhancement: added menu entries for saving or closing all open tabs.
MKVToolNix GUI: chapter editor enhancement: added menu entries for saving or closing all open tabs.
build system: MKVToolNix now requires a compiler that supports the following features of the C++14 standard: "std::make_unique()", "digit separators", "binary literals" and "generic lambdas". For the GNU Compiler Collection (gcc) this means v4.9.x or newer; for clang it means v3.4 or newer.
mkvmerge: MPEG TS/MPLS reader improvements: added support for subtitle tracks that are referenced from the MPLS file as sub-paths in other M2TS files than the main tracks.
MKVToolNix GUI: re-worked the startup code not to use lock files when trying to open a socket for communicating with an already-running instance. This aims to prevent situations with stale lock files not being cleaned up and the GUI not starting anymore as a result. This might fix or prevent issues like #1805.
mkvmerge: teletext subtitle bug fix: fixed the handling of DVB teletext subtitles signaled with data unit ID 0x02 and that contain pages from multiple magazines.
MKVToolNix GUI: multiplexer enhancement: the file identification process has been re-written to be properly multi-threaded. This allows the user to continue working with the GUI while e.g. playlists from a Blu-ray are identified.
mkvmerge: enhancement: mkvmerge can now handle Blu-ray playlists from the "BACKUP" sub-directory of a Blu-ray disc.
MKVToolNix GUI: new multiplexer feature: added a menu entry for copying the title to the destination file name. It will replace the destination file's base name but keep its path & extension.
MKVToolNix GUI: new multiplexer feature: all positive file identification results will now be cached between runs. This speeds up adding the same file a lot, especially when scanning the same Blu-ray playlists again. Cached results are invalidated automatically with newer MKVToolNix releases or when the source file changes.
MKVToolNix GUI: multiplexer enhancement: when the user tries to add one of the main Blu-ray index files (index.bdmv, MovieObject.bdmv) the GUI will automatically scan the Blu-ray playlist files and offer them for selection.
mkvmerge: bug fix: files smaller than 4 bytes were wrongly identified as MPEG transport streams.
MKVToolNix GUI: multiplexer enhancement: tracks, chapters, tags, attachments not selected for multiplexing will be displayed the same way as other disabled controls. Implements #1819.
mkvmerge: bug fix: the MPEG transport stream reader was using an outdated format for the "CodecPrivate" element for HDMV TextST subtitles. This has been updated to the current format which only contains the "dialog style element".
Existing Matroska files using this outdated scheme can be fixed by running them through mkvmerge v9.6.0 itself or any later release as the old format is automatically converted to the new one when it is read from Matroska files.
Deprecation warning: Several options and features are now deprecated and will be removed at the start of 2018. These are:
mkvmerge: the options "--identify-verbose", "--identify-for-gui", "--identify-for-mmg" and "--identification-format verbose". Please convert existing users of these interfaces to use mkvmerge's JSON identification output which can be invoked with "--identification-format json --identify …".
all command line tools: the old, proprietary format used for option files. Please convert users of this interface to the new JSON option file format introduced in this release.
all command line tools: the option "--check-for-updates" (the GUI will keep its online check for updates, though). There is and will be no equivalent interface in the tools themselves. Users of this interface can switch to retrieving the information about available updates directly from the MKVToolNix website.

New in MKVToolnix 9.6.0 (Nov 30, 2016)

New in MKVToolnix 9.5.0 (Oct 17, 2016)

mkvmerge, mkvextract: VobSub handling bug fix: mkvmerge and mkvextract will now update the duration stored in the SPU bitsream with the duration from the container level if it differs at least 1ms. Fixes #1771.
mkvmerge: h.264 elementary stream handling bug fix: if mkvmerge ever encounters changing SPS or PPS NALUs (ones where their ID has been encountered before with different settings) in the h.264 then it will prepend all following key frames with all currently active SPS and PPS NALUs. This enables playback from arbitrary key frames even if they require other SPS or PPS settings than the ones stored in the AVCC in CodecPrivate. Fixes #1711.
mkvmerge, mkvpropedit, MKVToolNix GUI: added support for the "field order" video track header element.
mkvinfo: added support for the "field order" video track header element.
mkvmerge: MPEG transport stream reader bug fix: fixed the handling of Blu-ray PCM audio with an odd number of channels by removing their alignment bytes.
mkvmerge: MPEG transport stream reader bug fix: fixed mis-detection of certain h.264 files as MPEG transport streams.
mkvmerge: WAV reader bug fix: the track properties (channels, sample rate) for DTS and AC-3 in WAV will now be derived from the decoded bitstream headers instead of the WAV file header as the latter is often incorrect.
mkvmerge: WAV reader bug fix: fixed detection and merging of DTS in WAV that uses the 14-bytes-in-16-bytes packing method.
MKVToolNix GUI: merge tool enhancement: added menu entries that execute the "close", "save settings", "start muxing" or "add to job queue" action for all currently open tabs
MKVToolNix GUI: merge tool enhancement: when dragging & dropping directories the GUI will process all files within those directories recursively instead.
mkvpropedit, MKVToolNix GUI's header editor: added options to modify the "muxing application" and "writing application" elements in the "segment information" container. Implements #1788
mkvmerge: bug fix: The Ogg/OGM reader did not recognize Opus files with comment headers anymore. This was broken by the fix to not require Ogg/OGM files to have comment headers in v9.4.0

New in MKVToolnix 9.4.2 (Sep 12, 2016)

New in MKVToolnix 9.4.1 (Sep 12, 2016)

New in MKVToolnix 9.4.0 (Aug 23, 2016)

mkvpropedit: bug fix: mkvpropedit will no longer say that it's writing the changes if only attachment changes are specified and none of the specified attachments can be found.
MKVToolNix GUI: chapter editor bug fix: overly long chapter names don't cause the GUI's window to become overly wide anymore. Fixes #1760.
mkvmerge: DTS bug fix: if present mkvmerge will use an XLL extension's sample rate information as the sample rate to put into the track headers. Fixes #1762.
mkvmerge: new feature: added support for reading Apple ProRes video from MOV/MP4 files. Patch by Chao Chen (see AUTHORS).
mkvmerge: bug fix: when appending files mkvmerge wasn't starting clusters on video key frame anymore for the first and all following appended files. Fixes #1757.
MKVToolNix GUI: merge tool enhancement: when adding attachments the GUI will check if there are attachments or attached files with the same name as the file to add. If so the GUI will tell the user and ask for confirmation.
mkvmerge: enhancement: mkvmerge now accepts file names in square brackets for appending files, e.g. "mvkmerge -o out.mkv [ in1.avi in2.avi in3.avi ]" instead of "mkvmerge -o out.mkv in1.avi + in2.avi + in3.avi".
mkvmerge: bug fix: VP8 in Ogg: fixed dropping the first frame and the timestamp calculation. Fixes #1754.
mkvmerge: bug fix: mkvmerge does no longer emit a warning if no comment header packet is found when reading tracks from Ogg/OGM files. See #1754.
MKVToolNix GUI: merge tool enhancement: the "select a play list to add" dialog does now contain a column with the number of chapters for each play list found.
MKVToolNix GUI: job queue enhancement: dragging & dropping a valid .mtxcfg file (either a full job file or one containing only merge settings without the job properties) onto the job queue window will import the dropped .mtxcfg job into the job queue. Rest of the implementation of #1714.
MKVToolNix GUI: merge tool enhancement: dragging & dropping a job queue .mtxcfg file onto the merge tool or using one as a command line parameter to the mkvtoolnix-gui executable will import the .mtxcfg job into the job queue. Part of the implementation of #1714.
MKVToolNix GUI: merge tool bug fix: the automatic adjustments to the output file name based on the track types selected for muxing and the mechanism for keeping output file names unique had been broken since release v9.3.0. Fixes #1743.
MKVToolNix GUI: merge tool enhancement: toggling the WebM mode check box will update the output file name's extension automatically.

New in MKVToolnix 9.3.1 (Jul 14, 2016)

New in MKVToolnix 9.3.0 (Jul 14, 2016)

build system: libEBML v1.3.4 and libMatroska v1.4.5 are now required due to several new elements having been specified for Matroska, and mkvmerge uses those elements.
mkvmerge, MKVToolNix GUI: new chapter generation feature: two new placeholders have been introduced when generating chapters for appended files, and . The former will be replaced by the appended file's name without its extension; the latter with its extension. Implements #1737.
MKVToolNix GUI: merge tool enhancement: when opening a saved configuration (via the menu as well as via drag & drop) the current tab will be replaced if it is empty ( = in the same state it is in right after creating new mux settings). Implements #1738.
mkvmerge, MKVToolNix GUI: added an option for specifying how much of a MPEG PS or TS file is probed for tracks probe-range-percentage). Implements #1734.
mkvmerge: MPEG TS: considerable parts of the module have been rewritten. Due to its convoluted structure didn't buffer PES packets properly before trying to parse the PES header leading to invalid memory accesses in certain cases.
mkvmerge: bug fix: fixed overly long file type detection in some cases when text subtitle type probing read a lot of data due to there being no carriage returns near the start of the file.
mkvmerge, mkvextract, MKVToolNix GUI: bug fix: several fixes to the handling of country codes. The list has been updated to reflect the currently valid top level domain country codes. Deprecated codes such as "gb" for "Great Britain" are now mapped to their updated values ("uk" for "United Kingdom" in this case). Fixes #1731.
mkvmerge: WavPack4 bug fix: relaxed the stream detection criteria to only require the major version to be 4 and not to check the minor version. Fixes #1720.
mkvmerge, mkvinfo: new feature: added flags to support the Colour elements in the video tracks of Matroska containers. Users can use those flags to specify the colour space, transfer function, chromaticity coordinates etc. These properties are useful for correct colour reproduction of high dynamic range / wide colour gamut videos
configure: fixed the Qt detection with Qt 5.7.0 which now requires the compiler to be in C++11 mode.
build system: libEBML v1.3.4 and libMatroska v1.4.5 are now required due to the usage of new elements introduced in
libMatroska v1.4.5. The copies included in the MKVToolNix source code have been updated to those releases as well.
mkvmerge: MP4 bug fix wrt. DTS handling: mkvmerge will re-derive parameters such as number of channels and sampling frequency from the DTS bitstream circumventing invalid values in the track headers (e.g. a channel count of 0). Fixes #1727/1728.
mkvmerge: TrueHD bug fix: fixed detection of 96 kHz sampling frequency.
mkvinfo's GUI: fix a crash due to wrong usage of referenced temporary objects. Fixes #1725.
MKVToolNix GUI: merge tool enhancement: the default track languages to set can now also be set whenever the language in the source file is 'undefined' ('und'). This is now the default and can be changed back to the old behavior (only set if the source file doesn't contain a language attribute) in the preferences. Implements #1697.
MKVToolNix GUI: merge tool enhancement: menus have been added to both the "start muxing" and the "add to job queue" buttons. The menus let the user override the preferences regarding clearing merge settings after starting to mux and after adding a job to the queue respectively. Implements #1696.
mkvmerge: the warning about not being able to determine whether a raw AAC file contains HE-AAC/AAC+/SBR has been removed. Implements #1701.
MKVToolNix GUI: enhancement: all file names are now displayed with their native path separators (e.g. "C:somewhereoutput.mkv" on Windows). Implements #1298, #1456.
MKVToolNix GUI: merge tool bug fix: the GUI now takes into account whether splitting is activated when looking for and warning due to existing destination files. Fixes #1694.
mkvmerge: bug fix: the parser for the --default-duration argument was wrongfully handling arguments of the form "123/456i" only this specific syntax and only with "i" as the unit; other formats and units were fine). This is part of #1673.
Additionally the parser doesn't use the "double" data type internally anymore fixing loss of precision and failing test cases on certain 32bit platforms. This fixes #1705.

New in MKVToolnix 9.2.0 (May 29, 2016)

MKVToolNix GUI: merge tool enhancement: the action "select all attached files" in the popup menu actions for the attached files view has been split up into "enable all attached files" and "disable all attached files". Implements #1698
MKVToolNix GUI: bug fix on Windows: removing the drive letter does not cause the colon to be removed automatically anymore. Fixes #1692
MKVToolNix GUI: merge tool bug fix: it's no longer possible to select "1" as the maximum number of files to split into as mkvmerge doesn't accept that value. Fixes #1695
mkvmerge: bug fix: the "interval" chapter generation mode was always creating one chapter too many
mkvmerge: bug fix: if a certain number of chapters had been generated with --generate-chapters then mkvmerge wasn't replacing the void placerholder with the actual chapters. Fixes #1693
MKVToolNix GUI: merge tool bug fix: the track column "default track in output" wasn't taking into account if the track had its "default track" flag set to "no" in the source file. This would result in the column showing "yes" in certain situations even though mkvmerge would assign "no"
mkvmerge: bug fix: fixed detection of (E-)AC-3 in MPEG TS files with unusual stream types (e.g. 0x87) but with (E-)AC-3 PMT descriptors. Fixes #1684
mkvmerge, mkvextract: bug fix: fixed handling of Big Endian PCM with a bit depth other than 16, 32 or 64 bits/sample. Other formats were using the Little Endian codec ID, but their content was actually not byte-swapped to match it. Now those other bit depths are byte-swapped to Little Endian, too. Fixes #1683.
mkvinfo: the change to start the GUI by default on Windows and Mac OS has been reverted. Instead a separate executable mkvinfo-gui) will be included for those platforms which starts the GUI by default. The newly introduced option "--no-gui" will remain valid but won't have any effect when used with mkvinfo.
mkvinfo GUI: enhancement: the window title now includes the file name. Implements #1679.
mkvmerge: enhancement: the "bit depth" track header field will be set for DTS tracks from the first DTS core header. Implements 1680.
mkvmerge: bug fix: the time zone portion of the "date_local" member of the JSON and verbose identification formats contained the time zone's name instead of its offset on Windows due to the Visual C++ runtime's std::strftime not being C++11 compliant.
Additionally this resulted in errors about invalid UTF-8 strings for locales where the time zone's name contained non-ASCII characters.

New in MKVToolnix 9.1.0 (Apr 24, 2016)

mkvmerge: MPEG TS/teletext enhancement: included the teletext page number in the JSON/verbose identification output as track property "teletext_page".
mkvmerge: MPEG TS bug fix: the "text_subtitles" property of the JSON/verbose identification modes was always set to true for all subtitle tracks, even for those that aren't text subtitles VobSub, PG)
mkvmerge: MPEG TS/teletext enhancement: if a teletext track contains multiple teletext pages then mkvmerge will now recognize all of those pages as separate tracks to merge instead of only merging the first page. See #1662
mkvmerge: MPEG TS/teletext enhancement: mkvmerge will now ignore obviously bogus PTS values for teletext tracks and use PTS from earlier audio or video packets instead. See #1662
mkvmerge: MPEG TS/teletext bug fix: the language code signaled in the MPEG TS PMT is taken into account when selecting the character encoding to use during decoding of the teletext subtitles, not just the "national character set" stored in the teletext page headers. For example, a German teletext page may signal "national character set" 0 (English) whereas it's actually 4 (German). See #1662.
mkvmerge: teletext decoding bug fix: fixed dropping of certain non-ASCII characters in rare circumstances due to wrong filtering of already UTF-8 encoded strings.
mkvmerge: MPEG TS reader enhancement: teletext tracks of type 5 hearing impaired) are recognized as subtitles, too. Implements 1662.
MKVToolNix GUI: merge tool enhancement: characters that aren't valid in path names are automatically removed from the output file name. Implements #1647.
MKVToolNix GUI: bug fix (Windows only): the GUI didn't start if the USERNAME environment variable contained characters that aren't allowed in file names (e.g. : or ?).
mkvmerge: AVI reader bug fix: fixed reading files where the file ends in the middle of an audio chunk. Fixes #1657
mkvextract: new feature: added support for extracting WebVTT subtitles. Implements the extraction part of #1592
mkvmerge: new feature: added support for reading WebVTT subtitles from WebVTT and Matroska files. Implements the merge part of #1592
mkvmerge: enhancement: when reading Matroska files not created by mkvmerge that contain chapters the existing edition UIDs and chapter UIDs are removed and random ones created. This is necessary as not only HandBrake but other tools assign sequential numbers starting at 1 for each file. Therefore there are two chapter entries with the UID 1, two with the UID 2 etc. and those should, strictly speaking, be treated as if they were a single chapter whereas the user expects those entries to stay separate entries
MKVToolNix GUI: new feature: added an option in the preferences "Merge" ? "Output") for controlling whether or not the GUI clears the "output file name" input upon removal of the last file
MKVToolNix GUI: new feature: added an option in the preferences "Merge" ? "Default values") for controlling whether or not the GUI clears the "file title" input upon removal of the last file
mkvmerge: bug fix: mkvmerge will no longer abort reading a Matroska file with a structural error right before the first cluster. Fixes #1654
mkvmerge: enhancement: added the muxing date in both local time zone and UTC to verbose/JSON identification outputs (keys "date_local" and "date_utc", formatted after ISO 8601) when identifying Matroska files
mkvmerge: enhancement: added the minimum timestamp for each track in verbose/JSON identification outputs (key "minimum_timestamp") when identifying Matroska files. At most the first ten seconds are probed; if no block is found for a track within that range then the key is not output for the track.
Also added "muxing_application" and "writing_application" to the "container" section of the output. Currently those are only set for Matroska files.
MKVToolNix GUI: merge tool change: attachments from source files have been moved from the "Tracks, chapters, tags and attachments" list on the "sources" tab to a new list on the "attachments" tab. That way all existing attachments and all the ones to newly add will be shown in a single tab. This makes it easier to decide which attachments will have to be added and which can be removed.
MKVToolNix: merge tool bug fix: when adding playlists the GUI won't ask the user whether or not to scan if there's only a single playlist in that directory.
mkvmerge: bug fix: AVC/h.264: fixed handling of interlaced frames with bottom field first
MKVToolNix GUI: bug fix: fixed huge memory consumption e.g. allocation of 2 GB for a JSON file of 650 KB) in the JSON library by updating said JSON library. Fixes #1631

New in MKVToolnix 9.0.1 (Mar 28, 2016)

New in MKVToolnix 9.0.0 (Mar 27, 2016)

Installer: fixed support for silent installation and uninstallation.
mkvmerge: bug fix: fixed two more issues in the conversion of teletext subtitles to SRT subtitles:
Packets belonging to pages that don't contain subtitles were used as valid end points for subtitles causing entries to become very short (e.g. 40ms).
Sometimes the timestamps of wrong packets were used as entry's start and end points causing start timestamps and durations that were slightly off.
mkvmerge: MP4/QuickTime reader: audio tracks with the FourCC lpcm' are muxed as A_PCM/INT/LIT instead of A_QUICKTIME mkvmerge: bug fix: MP4/QuickTime reader: audio tracks can contain two instances of certain header fields (channel count bits/sample & channel, sample rate) in the STSD atom: one instance in the version 0 header and one in the version 2 header parts. So
far mkvmerge has used those from the version 0 header only and ignored the ones from the version 2 header. This has been changed to match the behavior of other players and MP4 readers like ffmpeg. If the STSD atom contains a version 2 structure then the fields from it will be used. Otherwise the fields from the version 0 part will be used
all: new feature: added a new translation of both the programs and the man pages to Korean by Potato (see AUTHORS)
MKVToolNix GUI: chapter editor enhancement: added a button next to the 'segment UID' controls that enable the user to select a Matroska file. The GUI reads that file's segment UID and enters its value into the input field
build system: added an option to configure without-qt-pkg-configÂ«. Normally configure uses pkg-config for detecting Qt and setting QT_CFLAGS and QT_LIBS. With this option configure won't use pkg-config and rely on the user having set both variables before running configure. This enables using Qt on systems where no pkg-config files are generated (e.g. Qt 5.6.0 on MacOS with frameworks enabled)
mkvinfo: change: on Windows and Mac OS mkvinfo will now launch the GUI by default unless the option Â»--no-guiÂ« (or Â»-GÂ«) has been given. This is due to the fact that on both OS users often use portable versions respectively disk images and launch the executable directly and not via start menu entries. In those situations adding command line options for launching the GUI is unnecessarily difficult.
mkvmerge: bug fix: fixed two issues in the conversion of teletext subtitles to SRT subtitles:
Consecutive teletext packets with the same content are now merged into a single entry instead of resulting in multiple entries.
The calculation of a packet's duration was wrong in certain situations.
MKVToolNix GUI: merge tool (playlist selection dialog) enhancement: the playlist items are sorted by their position within the playlist by default.
MKVToolNix GUI: merge tool (playlist selection dialog) enhancement: double-clicking on a playlist will select and add that playlist.
mkvmerge: enhancement: added the number of bits per sample to the verbose/JSON identification output for FLAC files.
mkvextract: bug fix: fixed the duplication of VPS, SPS, PPS and SEI NALUs when extracting h.265/HEVC tracks. See #1076 and #1621.
mkvmerge: bug fix: reverted the patch that made the h.265/HEVC not store SEI NALUs with the frames during
muxing. It was supposed to prevent having the SEI NALUs present twice when extracting HEVC due to some SEI information also being stored in the codec private data, but it dropped a lot of other SEI NALUs irrevocably. Fixes #1621.
mkvmerge: bug fix: the --sub-charset option is now ignored for text subtitle files that start with a byte-order mark (BOM) bringing the behavior in line with the documentation. Fixes #1620.
mkvextract: new feature: implemented the extraction of Big Endian PCM (codec ID A_PCM/INT/BIG) to WAV files. The content will be byte-swapped into Little Endian PCM in the process.
mkvmerge: enhancement: Big Endian PCM tracks will now be byte-swapped into Little Endian PCM, and the codec ID A_PCM/INT/LIT will be used. This was done due to a lot of players not supporting Big Endian PCM inside Matroska.
mkvmerge, MKVToolNix GUI: new feature: added switches (generate-chapters and generate-chapter-name-template) and their corresponding UI items for generating chapters while muxing. Two modes are currently supported: when-appending which creates one chapter at the beginning and an additional one each time a file is appended and interval which generates chapters in fixed intervals Implements mkvmerge's and the GUI's part of #1586
MKVToolNix GUI: job queue enhancement: completed jobs will now be removed from the queue automatically on exit if the job has been added more than 14 days ago in order not to let the queue grow arbitrarily large. This feature can be turned off and the number of days can be adjusted in the preferences.
mkvpropedit, MKVToolNix GUI's header editor: bug fix: fixed the handling of files where the last level 1 element has an unknown size. The programs will now either fix this element to have a known size or abort the process with an appropriate error message but without modifying the file. Fixes #1601.
mkvextract: enhancement: when extracting chapters in the simple format the user can use the new option 'simple-language' for selecting the chapter names that are output. Normally the first chapter name found in each atom is used. With this option mkvextract looks for a chapter name whose language matches the specified one. Implements the feature enhancement part of #1610.
mkvextract: several issues regarding the extraction of chapters in the simple format have been fixed: if multiple names with different languages were present then an entry had been written for each name; the total number of entries written was wrong; the wrong entries were written. The new code only writes the first name found from the top-most chapter atoms of all editions. Chapters flagged as hidden or as not enabled are not extracted at all. Fixes the bug part of #1610.
MKVToolNix GUI: new chapter editor feature: added an option to multiply all chapter timecodes by a factor to the "additional modifications" dialog. Implements #1609.

New in MKVToolnix 8.9.0 (Feb 22, 2016)

MKVToolNix GUI: the default font size adjustment has been deactivated for the time being as it causes problems on high DPI displays. See #1602
MKVToolNix GUI: bug fix: ampersands (&) in file names were shown as keyboard shortcuts in tab titles in various tools (merge tool, chapter and header editors, job output tool). Fixes #1603
MKVToolNix GUI: header editor enhancement: when the user drags & drops files on an open header editor tab the GUI will ask the user what to do with them: either open the files as new header editor tabs or add the files as new attachments to the current tab. The action can also be set as the default. Implements #1585
MKVToolNix GUI: chapter & header editor enhancement: Matroska files are initially opened in read-only mode and only later re-opened in read/write mode in order to enable reading from write-protected files. Part of the implementation of #1594
MKVToolNix GUI: chapter & header enhancement: the error messages shown when a Matroska file could not be parsed have been improved to include the most likely reasons. Part of the implementation of #1594
MKVToolNix GUI: chapter editor enhancement: added a menu entry for removing chapters from an existing Matroska file. Inspired by #1593
MKVToolNix GUI: chapter editor enhancement: it is now possible to save chapters to Matroska files after having removed all entries (editions and chapter atoms). This effectively removes the chapters from the file. Implements #1593
MKVToolNix GUI: job queue enhancement: added keyboard shortcuts for removing all completed jobs and for removing successfully completed jobs. Implements #1599
MKVToolNix GUI: merge tool enhancement: added icons to the context menu actions in the "attachments" sub-tab. Implements #1596
MKVToolNix GUI: merge tool enhancement: made the context menu entries in the "attachments" sub-tab clearer. Implements #1597
mkvmerge: bug fix: fixed the handling of AVIs with a negative video height (which signals that the rows are arranged top-to-bottom)
MKVToolNix GUI: job queue bug fix: fixed an invalid memory access in the "edit in corresponding tool and remove from queue" functionality
MKVToolNix GUI: re-write, merge tool bug fix: the file identification is now based on mkvmerge's JSON output instead of its verbose output. This also fixes the merge tool not showing names of attachments inside Matroska files properly if those names contain spaces (#1583)
MKVToolNix GUI: merge tool bug fix: the "mux this" combo box was disabled if a single attachment was selected
mkvmerge: bug fix: removed spurious output generated during file identification in the HEVC detection code (e.g. "Error No Error")
mkvmerge: bug fix: fixed the output of the "playlist_file" and "other_file" properties of the "container" entity in the JSON identification format from a single string to an array of strings. The format version has been bumped to 3 due to this change
docs: added a Polish translation of the man pages by Daniel Kluz (see AUTHORS)
MKVToolNix GUI: "run program after XYZ" enhancement: configurations can now be deactivated without having to change them. Implements #1581
mkvmerge: bug fix: fixed parsing of AAC in MP4 with a program config element with an empty comment field at the end of the GA specific config. Fixes #1578
mkvmerge: enhancement: when reading Matroska files created by HandBrake that contain chapters the existing edition UIDs and chapter UIDs are removed and random ones created. This is necessary as HandBrake assigns sequential numbers starting at 1 for each file. Therefore there are two chapter entries with the UID 1, two with the UID 2 etc. and those should, strictly speaking, be treated as if they were a single chapter whereas the user expects those entries to stay separate entries. Implements an improvement for issues such as #1561
MKVToolNix GUI: merge tool bug fix: the GUI no longer requires at least one source file to be present before muxing can start in order to allow creation of track-less files. Fixes #1576
MKVToolNix GUI: enhancement: the "escape for Windows' cmd.exe" mechanism will only escape arguments that actually need escaping in order to produce easier to read command lines
mkvmerge: QuickTime/MP4 reader: fix a division by zero in the index generation for certain old audio codecs that have certain header fields (bytes_per_frame, samples_per_packet) set to 0
mkvinfo: bug fix: global elements (EBML void and CRC-32 elements) are now handled correctly if they're located inside the segment info or the chapter translate parents

New in MKVToolnix 8.8.0 (Jan 11, 2016)

MKVToolNix GUI: "run program after XYZ" enhancement: added a button for executing the program right now as a test run. See 1570.
MKVToolNix GUI: "run program after XYZ" enhancement: an error message is shown if the program couldn't be executed. See #1570.
MKVToolNix GUI: "run program after XYZ" enhancement: any leading spaces in the executable path are removed in order to make copying & pasting less error-prone.
MKVToolNix GUI: "run program after XYZ" bug fix: the paths used in the variables and the executable are converted to the platforms native path separators. This fixes compatibility with Windows applications that don't support the use of forward slashes in path names like e.g. VLC. See #1570.
mkvpropedit: enhancement: mkvpropedit will accept terminology variants of ISO 639-2 language codes and convert them to the bibliographic variants automatically. Implements #1565.
MKVToolNix GUI: enhancement: the GUI's default font's size is now scaled with the screen's DPI and is at least 9 points high (up from 8). Additionally on Windows "Segoe UI", which is Windows' default user interface font, is used instead of the default provided by Qt, "MS Shell Dlg 2".
MKVToolNix GUI: enhancement: the user can select the font family and size for the GUI in the preferences.
mkvmerge: bug fix: fixed TrueHD detection both as raw streams as well as inside other contains if the stream does not start with a TrueHD sync frame.
MKVToolNix GUI: new merge tool feature: added a layout for the track properties where they're on the right of the files/tracks lists in two fixed columns. Implements #1526.
mkvmerge: bug fix: fixed a mis-detection of an MPEG-2 video elementary stream as a TrueHD file which then caused a segmentation fault. Fixes #1559.
mkvmerge: bug fix: Matroska attachments with the same name, size and MIME type were not output during file identification.
MKVToolNix GUI: merge tool enhancement: added a column to the attachments" tab containing the file size.
MKVToolNix GUI: enhancement: pressing the insert key when the focus is on the merge tool's source files or attachments list, on the chapter editor's chapter list or on the header editor's list will invoke the corresponding action for adding elements to that list.
MKVToolNix GUI: merge tool bug fix: when using one of the "select all tracks (of typeâ€¦)" actions the "properties" column didn't show the selection.
MKVToolNix GUI: new feature: implemented adding, changing and removing attachments in existing Matroska files as part of the header editor. Implements #1533.

New in MKVToolnix 8.7.0 (Jan 5, 2016)

mkvmerge: bug fix: fixed the handling of a PES size of 0 ( = unknown). Tracks whose PES packets had such a size were sometimes not detected at all, and even if they were their content was incomplete. Fixes #1553.
mkvmerge: bug fix: made the MPEG 1/2 video elementary stream file type recognition more resilient and more flexible dropping the requirement for a file to start with an MPEG start code (0x00 00 01). Fixes #1462.
mkvpropedit: bug fix: when changing the track language it is now verified to be a valid ISO 639-2 language code before writing it to the file. Fixes #1550.
mkvmerge: enhancement: the MP4 reader will keep the display dimensions from the track header atom ("tkhd") and use them as the display width & height. See also #1547.
MKVToolNix GUI: merge tool enhancement: the "add source files" button now has optional popup menu containing actions for adding/appending files and adding files as additional parts for easier discovery of those actions. This popup is only shown if the user clicks on the arrow shown on the right of the button.
mkvmerge: new feature: TrueHD tracks that contain Dolby Atmos will be identified as "TrueHD Atmos". Implements #1519.
mkvmerge: bug fix: the Matroska reader now uses TrueHD-specific code when reading Matroska files. This can fix things like wrong frame type flags.
mkvmerge: bug fix: MP4 edit lists of certain types (two entries, first entry's media_time is -1, second entry's segment_duration is 0) weren't handled properly resulting in key frame flags being assigned to the wrong frames. Fixes #1547.
mkvmerge: bug fix: the h.265/HEVC code was writing SEI NALUs twice. This had already been mentioned in #1076 but never fixed. Patch by VladimÃr PilnÃ½.
mkvmerge: bug fix: the h.265/HEVC code wasn't converting slice NALUs to RBSP form before parsing it resulting in wrongly timestamped frames under certain conditions. This is a similar fix to the issues reported in #918 and #1548.
mkvmerge: bug fix: the h.264/AVC code wasn't converting slice NALUs to RBSP form before parsing it resulting in wrongly timestamped frames under certain conditions. Fixes #918 and #1548.
mkvmerge: bug fix: the MP4 reader can now understand the 'random access point' sample grouping information for marking open GOP random access points as key frames. Fixes #1543.
mkvmerge: bug fix: fixed the decisions whether or not to write the last frame of a track as a BlockGroup or a SimpleBlock and whether or not to write a block duration for that frame. Fixes 1545.
MKVToolNix GUI: new merge tool feature: added menu options in the "Merge" menu for copying either the first source file's name or the current output file's name into the "file title" control.
mkvpropedit: new feature: added an option for calculating statistics for all tracks and adding new/updating existing statistics tags in a file. Second half of the implementation of 1507.
mkvmerge: bug fix: the progress calculation was sometimes outputting negative numbers when appending Matroska files whose timestamps don't start at 0 (e.g. if they were created by splitting with linking enabled). In the the GUI this resulted in lines like "#GUI#progress -2%" in the job's output.
mkvpropedit: new feature: added an option for removing all existing track statistics tags from a file. Part of the implementation of #1507.
mkvmerge: bug fix: AAC with low sampling frequencies was sometimes mis-detected with the wrong profile preventing appending it to other AAC tracks. Fixes #1540.
mkvmerge: bug fix: chapters were output as both "chapters" and "track_tags" in JSON identification mode. Fixes #1538.
mkvmerge: enhancement: added the container's internal track ID as the "number" attribute in verbose & JSON identification modes for several container types (QuickTime/MP4: the track ID from the tkhd' atom; MPEG program stream: the sub-stream ID in the upper 32 bits and the stream ID in the lower 32 bits; MPEG transport stream: the program ID; Ogg/OGM: the stream's serial number field; RealMedia: the track ID). Implements #1541.
MKVToolNix GUI: bug fix: the "split mode" drop-down box got reset to "do not split" each time the preferences dialog was closed with the "OK" button. Fixes #1539.
mkvmerge: enhancement: if JSON identification mode is active then warnings and errors will be output as JSON as well. They're output as arrays of strings as the keys "warnings" and "errors" of the main JSON object. Implements #1537.
all: reversion of a change: several ISO 639-2 codes of languages that are very old and not spoken anymore have been re-added e.g. "English, Middle (1100-1500)") due to feedback from users who did have a use for such codes.
all: reversion of a change: all of the tools will write a byte-order mark (BOM) to text files encoded any of the UTF-* schemes again. This reverts the change in release 8.6.0 due to user feedback preferring the old way.
mkvpropedit: enhancement: when using --add-attachment, replace-attachment or --update-attachment the UID can be changed with --attachment-uid. See #1532.
mkvpropedit: new feature: added an option "--update-attachment" for updating the properties of existing attachments without replacing their content. Implements #1532.
MKVToolNix GUI: new feature: added options for running arbitrary programs after a job has finished or after the queue has finished. Implements #1406.
MKVToolNix GUI: merge tool enhancement: if files are dragged & dropped from an external application with the right mouse button being pressed then the GUI will always ask the user what to do with the files even if the user has configured the GUI not to ask. Implements #1508.
MKVToolNix GUI: enhancement: when starting the GUI with a saved settings file then the GUI won't contain an empty tab in the merge tool anymore. Fixes #1504.
mkvmerge: bug fix: fixed the key frame detection for VP9 video tracks.
MKVToolNix GUI: bug fix: relative file names given on the command line were interpreted as being relative to the user's home directory. Fixes #1534.
MKVToolNix GUI: the preferences dialog has been reworked heavily in order to provide a better overview and to be less overwhelming.

New in MKVToolnix 8.6.1 (Nov 30, 2015)

New in MKVToolnix 8.6.0 (Nov 30, 2015)

all: change: none of the tools will write a byte-order mark (BOM) to text files encoded any of the UTF-* schemes anymore.
mkvmerge: Matroska reader bug fix: the info about which packetizer is used was output twice for each HEVC track. Fixes 1522.
MKVToolNix GUI: bug fix: implemented a workaround for a bug in Qt which caused the GUI not to start anymore due to failing to detect a stale lock file if the GUI had crashed before on a computer with a host name that included non-ASCII characters.
mkvmerge: bug fix: a track's number of bits per audio sample wasn't output in verbose identification mode even if it was present in the file.
mkvmerge: enhancement: if no seek head is found before the first cluster when reading Matroska files then mkvmerge will attempt a deeper scan of all elements in the file in order to find track headers, attachments, chapters and tags located at the end of the file. See #1513 for the rationale.
MKVToolNix GUI: header editor bug fix: the "status" description wasn't adjusting its height properly resulting in its text being cut off. Fixes #1517.
MKVToolNix GUI: bug fix: the program changes its working directory to the user's profile/home directory on startup allowing the removal of its installation folder even if a program started by the GUI (e.g. a web browser) is still running. Fixes #1518.
ebml_validator: bug fix: elements with an unknown size weren't handled correctly.
build system: fixed building and linking against libEBML and libMatroska if they're installed in a non-standard location.
mkvpropedit, MKVToolNix GUI's chapter and header editors: the tools were unable to update elements in files without a seek head present. Fixes #1516.
mkvmerge: bug fix: fixed two issues causing mkvmerge to write invalid data when updating track headers caused by the fix for "Re-rendering track headers: data_size != 0 not implemented yet". Fixes #1498.
all: MKVToolNix now requires gcc 4.8.0 or later or clang 3.4 or later for compilation.
MKVToolNix GUI: bug fix: the options for linking to the next/previous segment UID were wrong. Fixes #1511.
mkvmerge: enhancement: added JSON as an output format for file type identification. It can be activated with "--identification-format json --identify yourfile.ext" (or their short counterparts "-F json -i yourfile.ext").
mkvmerge: bug fix: the VC-1 handlig code was duplicating the first sequence headers with each mux. Fixes #1503.
build system: bug fix: configure was checking for and using libintl if --without-gettext was used. Fixes #1501.

New in MKVToolnix 8.5.2 (Nov 5, 2015)

New in MKVToolnix 8.5.1 (Oct 21, 2015)

New in MKVToolnix 8.5.0 (Oct 18, 2015)

mkvmerge: bug fix: the cropping parameters contained the "cropping:" prefix twice in the verbose identification output
MKVToolNix GUI: merge tool enhancement: when dropping files onto the GUI the last file's directory is remembered as the last directory a file was opened from causing the next open file dialog to start in that directory. Implements #1477
all: new feature: added a Catalan translation of the man pages
MKVToolNix GUI: chapter editor enhancement: the start and end timestamps in the tree are displayed with nanosecond precision. Implements #1474.
MKVToolNix GUI: merge tool enhancement: added a column to the track list containing the state of the "forced track" flag. Implements #1472.
MKVToolNix GUI: merge tool enhancement: pressing the delete key in the attachments list removes the selected entries. Implements 1473.
MKVToolNix GUI: enhancement: if the last directory opened doesn't exist anymore then default to one that does in order to prevent an error message from older Windows versions about a location not being available. Fixes #1438.
MKVToolNix GUI: enhancement: the context menu for the status bar job status counters is now shown when the user clicks with any mouse button, not just the right one. This should make the feature easier to discover. Implements #1396.
MKVToolNix GUI: new job queue feature: added an option in the preferences for resetting the warning and error counters of all jobs and the global counters in the status bar to 0 when exiting the program. Implements #1437.
MKVToolNix GUI: current job output enhancement: the separator lines for warnings and errors ("--- Warnings emitted by Job â€¦ started on â€¦ ---") are only shown when warnings/errors actually occur and not for each job that's run.
MKVToolNix GUI: bug fix: the menus that are currently not shown are disabled properly so that they don't react to keyboard shortcuts anymore. This affected e.g. Alt+J with the English localization as there were three shortcuts active: the "add to job queue" button (if the merge tool is active), the "job queue" menu and the "job output" menu.
MKVToolNix GUI: bug fix (Windows): changed some options for Qt's file dialogs in order to speed up access to network shares in certain situations. Fixes #1459.
mkvmerge: enhancement: improved identification output for DTS 96/24. Implements #1431.
mkvmerge: bug fix: PCM tracks: if the number of samples per packet varies then no default duration will be written. Fixes #1426.
MKVToolNix GUI: merge tool enhancement: added buttons for previewing the character sets for text subtitles read from SRT and SSA/ASS files as well as for chapter files. They're located next to the drop down boxes for the character sets on the input and output tabs.
MKVToolNix GUI: merge tool enhancement: added buttons next to the 'segment UID', 'previous segment UID' and 'next segment UID' controls that enable the user to select a Matroska file. The GUI reads that file's segment UID and enters its value into the corresponding control. Part of the implementation of #1363.
mkvmerge: new feature: The three options that use segment UIDs segment-uid, --link-to-previous and --link-to-next) can now read the segment UID of an existing Matroska file. For this the file's name must be given as an argument prefixed with = e.g. '--segment-uid =some_file.mkv'). Implements #1363.
MKVToolNix GUI: chapter editor enhancement: Added another variable to the chapter name templates called which is replaced by the chapter's start timestamp. An optional format can be specified, e.g. resulting in something like 01:35:27.734. This can be used in the 'generate sub-chapters' or the 'renumber sub-chapters' functionality. Implements #1445.
MKVToolNix GUI: merge tool bug fix: If there's currently no source file present when the user drags & drops files onto the merge tool then the GUI will no longer leave an empty, superfluous tab for certain drop modes. Fixes #1446.
MKVToolNix GUI: merge tool enhancement: implemented the optional warning before overwriting existing files when starting to mux or adding a job to the queue. The pending jobs in the queue are checked for the same destination file name as well. Implements 1390.
MKVToolNix GUI: enhancement: pressing the delete key in the chapter editor and the job queue removes the selected entries. Implements #1454.
MKVToolNix GUI: merge tool enhancement: dropping chapter, tag and segment info files from external applications will cause those file names to be added to the appropriate controls on the 'output' tab. Implements #1332 and 1345.
MKVToolNix GUI: merge tool enhancement: the feature "default track language" has been split into track languages by type. There are now three separate settings for audio, video and subtitle tracks. Implements #1338.
mkvmerge: enhancement: the verbose identification for MP4 files will now derive basic audio parameters of MP3 and AC3 tracks from the bitstream instead of relying on the values in the track headers.
MKVToolNix GUI: new merge tool feature: implemented an optional vertical layout mode for the "input" tab in which the track properties are shown below the track list. Implements #1304.
MKVToolNix GUI: merge tool bug fix: the "default track flag in output" column wasn't updated properly directly after loading settings.
MKVToolNix GUI: merge tool enhancement: when browsing for chapter files on the "output" tab the initial directory is the first input file's directory instead of the directory accessed last.
MKVToolNix GUI: merge tool bug fix: the cropping parameters were not converted into parameters for mkvmerge at all.
all: several ISO 639-2 codes of languages that are very old and not spoken anymore have been removed (e.g. "English, Middle 1100-1500)").
MKVToolNix GUI: enhancement: on Windows the drop down boxes were elliding overlong text. This has been changed to making the open combo boxes' scroll areas wide enough to contain the whole entries. This matches the behavior of Qt on other operating systems.
all: fixed the spelling of the AC-3, E-AC-3 and VC-1 codec names.
MKVToolNix GUI: new merge tool feature: added context menu entries for opening the selected files/the source files of selected tracks in MediaInfo. Implements #1423.
MKVToolNix GUI: bug fix: the interface language selection has been improved not to select wrong entries resulting in error messages from mkvmerge about unknown translations. Fixes #1434.
MKVToolNix GUI: bug fix: if the Windows version of the GUI was started from a symbolically linked folder then it would crash when the user added a file. Fixes #1315.

New in MKVToolnix 8.4.0 (Sep 20, 2015)

MKVToolNix GUI: chapter editor bug fix: whenever the additional modification of 'expanding start/end timecodes to include the minimum/maximum timecodes of their children' was run on an edition entry then ChapterTimeStart and sometimes ChapterTimeEnd nodes were inserted as direct children of the EditionEntry node when saving. This resulted in invalid chapters.
MKVToolNix GUI: new merge tool feature: when dragging & dropping files onto merge settings already containing a file the user can set more options to be always done instead of asking (before: only adding files to the current merge settings could be thus marked;
now: adding to current, adding to new settings and adding each file to new settings can be set to perform without asking). Implements #1388.
MKVToolNix GUI: merge tool enhancement: when dragging & dropping files onto merge settings already containing a file the dialog asking the user what to do has received a new option for creating one new merge tab for each of the dropped files. Implements #1380.
mkvmerge: bug fix: the pixel dimensions reported for VC-1 in MPEG transport streams in verbose identification mode was 0x0.
mkvmerge: bug fix: the number of channels and the sample rate reported for DTS in MPEG transport streams and MPEG program streams in verbose identification mode was 0.
mkvmerge: container and track properties in verbose identification mode are now output sorted.
MKVToolNix GUI: new merge tool feature: the 'tracks' tree view contains a new column titled 'properties' which contains basic track properties: the pixel dimensions for a video track and sampling frequency, number of channels and bits per sample for an audio track. Implements #1295.
mkvmerge: enhancement: the verbose identification result for all audio tracks has been extended to include the number of channels, the sample rate and the bits per sample where applicable. Part of the implementation of #1295.
all: bug fix: parsing of strings containing negative values or timecodes was broken on 32bit architectures. Fixes #1425.
mkvmerge: the verbose identification result for the MPEG program stream, MPEG transport stream and WAV readers has been changed for audio tracks in order to match the Matroska reader's result. The old keys 'channels', 'sample_rate' and 'bits_per_sample' have been replaced by 'audio_channels', 'audio_sampling_frequency' and 'audio_bits_per_sample'.
mkvmerge: enhancement: the pixel width/height will be reported in verbose identification mode for all video tracks.
MKVToolNix GUI: new merge tool feature: added a column in the track list showing the effective state of the 'default track' flag. It shows the state of the flag as it will be in the output file. Implements #1353.
mkvmerge: enhancement: when mkvmerge encounters garbage data in the middle of AC3 or MP3 tracks it will now output the timecode where the garbage occurred in order to make checking for audio/video sync issues easier. Implements #1420.
MKVToolNix GUI: chapter editor enhancement: added a column in the tree with the edition's/chapter's flags.
MKVToolNix GUI: new feature: the state of all columns in all list/tree views can be reset (both the shown/hidden state as well as their order) from the column's context menu. See #1268.
MKVToolNix GUI: new feature: the column headers of all list/tree views can be re-ordered via drag & drop and the GUI will remember their position upon restart. Additionally the columns can be hidden/shown via a context menu by right-clicking on the column headers. Implements #1268.
MKVToolNix GUI: new chapter editor feature: added an option for skipping chapters marked as "hidden" in the re-numbering dialog. Implements #1414.
all: new feature: added a new translation to Serbian (Cyrillic)
MKVToolNix GUI: enhancement: the header editor will convert ISO 639-2 terminology codes used in language elements to their corresponding bibliographic variants. Implements #1418.
MKVToolNix GUI: merge tool bug fix: if the output file name policy 'last output directory' was used then manual changes to the output file name weren't recognized as changes to the last output directory. Fixes #1411.
MKVToolNix GUI: merge tool bug fix: the 'default subtitle charset' is not applied to text subtitles from Matroska files as those are always encoded in UTF-8. Fixes #1416.
MKVToolNix GUI: enhancement: the titles and button texts of dialogs asking questions have been improved to be easier understandable. For example, instead of using 'yes/no' as the answers to the question 'Do you want to close the unmodified file?' the choices are now 'Close file/Cancel'. Implements #1417.
MKVToolNix GUI: chapter editor bug fix: the 'shift timecodes' action in the mass modification dialog wasn't working at all, and selecting multiple actions in the dialog would result in wrong actions being executed.
MKVToolNix GUI: chapter editor enhancement: when loading simple/ OGM style chapter files that contain non-ASCII characters and which do not start with a byte order mark (BOM) the GUI will let the user chose the character set to use. A preview is shown for the selected character set and updated when the user changes the character set.
MKVToolNix GUI: merge tool enhancement: added 'remove all' and 'select all' entries to the attachments context menu. Implements 1386.
MKVToolNix GUI: job output enhancement: the output, warnings and error text views are now separated by two splitters enabling the user to change their respective sizes. These changes are remembered over restarts. Implements #1394.
MKVToolNix GUI: chapter editor enhancement: pressing shift+return will cause the next appropriate chapter control to be selected depending on where the focus currently is: from a chapter input (start/end time, flags, UIDs) to the next chapter entry's start time, from a chapter name to the next chapter name and from the last chapter name to the next chapter entry's first chapter name. Implements #1398 and complements #1358.
MKVToolNix GUI: chapter editor enhancement: pressing return on the very last chapter entry will wrap and focus the first one in the tree again. Enhances #1358.
MKVToolNix GUI: bug fix: fixed the total job queue progress with respect to removing completed jobs (either automatically or manually). Fixes #1405.
MKVToolNix GUI: bug fix: mkvmerge is now run in with the same interface language set for the GUI.
mkvmerge: bug fix: The formula used for calculating the audio delay for garbage data at the start of tracks in AVI files has been fixed again. It now uses the values dwStart, dwScale and dwSampleSize from the AVI stream header structure instead of values derived from the audio packet headers. Fixes #1382 and still works correctly for #1137.
MKVToolNix GUI: enhancement: scrolling over input elements like combo boxes, check boxes and radio buttons located within a scroll area will now scroll the scroll area instead of the element the cursor is over (e.g. a combo box). Implements #1400.
all: the environment variable _OPTIONS is now parsed for options for TOOL (e.g. MKVMERGE_OPTIONS for mkvmerge). MKVTOOLNIX_OPTIONS is still used for all programs. Fixes #1403.
MKVToolNix GUI: bug fix: fixed the escaping of the command line for cmd.exe regarding the command name itself (the very first argument). Fixes #1401.
build system: removal: the switch '--without-mkvtoolnix-gui' has been removed. There are only two GUIs left in the package: the Qt-enabled mkvinfo and MKVToolNix GUI. Both are enabled by default and can be disabled with the option '--disable-qt'. In that case only the text-mode version of mkvinfo is built, and the MKVToolNix GUI is not built at all.
Removal: all support for wxWidgets has been removed. This means that the mkvmerge GUI (mmg) has been removed and that mkvinfo now only supports a text-mode and a Qt-based interface.

New in MKVToolnix 8.3.0 (Aug 17, 2015)

MKVToolNix GUI:
Chapter editor enhancement - pressing return will cause the next appropriate chapter control to be selected depending on where the focus currently is - from a chapter input to the first chapter name, from a chapter name to the next chapter name and from the last chapter name to the next chapter entry's start time.
Enhancement - the number of running jobs is shown in the status bar.
New job queue feature - added a context menu for force-starting selected jobs. This allows for running more than one job at the same time.
New merge tool feature - added an option for automatically setting the > >default track< < flag to > >no< < for all subtitle tracks when they're added.
New merge tool feature - dragging & dropping files onto line edit controls that expect file names (e.g. the > >chapter file< < control) will set that line edit's text to the dropped file name.
New feature - jobs in the queue can now be edited again. For that they're re-opened in the corresponding tool and removed from the queue.
Enhancement - the format of the setting and queue files has been changed from INI style to JSON documents. Reading older setting files in INI style remains supported, but saving will convert them to JSON.
Together with the other three changes mentioned below this results in a noticeable reduction in the time needed for writing the queue files, e.g. when pressing > >start muxing< < or when quitting the application.
Enhancement - the way the job queue is stored has been changed. Earlier all jobs were stored in the same file (or registry on Windows) as the preferences. Now they're stored in a sub directory called > >jobQueue< < with one file per queue entry.
Enhancement - on Windows the preferences are not stored in the registry anymore, not even if the application has been installed. Instead they're stored in an INI file in the user's AppData\Local directory tree.
Enhancement - the number of times the queue files are saved has been reduced. The queue files are also loaded only once on startup, not twice.
Bug fix - fixed various crashes when dragging & dropping in all of the tree views (merge tool: files view, tracks view, attachments view; chapter editor: edition/chapter tree, chapter name list; job queue).
Enhancement - if an instance is already running when the application is started a second time then the GUI requests that the already-running instance will be activated.
New feature - added an option in the preferences for automatically switching to the job output tool whenever the user starts a job (e.g. by pressing > >start muxing< >Simple OGM-style chapter files (*.txt)< < to the file selection dialog when selecting a chapter file
Bug fix - fixed compilation when building without curl support.
mkvmerge:
bug fix - track statistics tags can be kept with the option > >--engage keep_track_statistics_tags< < This allows outputting them in verbose identification mode for easier parsing.
build system:
stack protection is enabled when building with gcc on all platforms. For Windows DEP and ASLR is enabled.
the Boost detection macros were updated from www.gnu.org resulting in better compatibility with bare-bones shells like dash.

New in MKVToolnix 8.2.0 (Jul 20, 2015)

mkvmerge, MKVToolNix GUI: bug fix: fixed the container type not being recognized properly by the GUI. Now the numerical container type ID is output in verbose identification mode by mkvmerge.
MKVToolNix GUI: chapter editor enhancement: the template for chapter names can now contain a number of places for the chapter number, e.g. '. The number will be zero-padded if there are less places than specified.
MKVToolNix GUI: new chapter editor feature: implemented a function for renumbering chapters. This allows the user to automatically assign new chapter names to one level of sub-chapters with ascending numbers. Implements #1355.
MKVToolNix GUI: new feature: the position of the tab headers of all tab widgets can be changed in the preferences. Implements 1334.
MKVToolNix GUI: new feature: added an option for hiding the tool selector.
MKVToolNix GUI: new job queue feature: added menu options for stopping the queue either immediately or after the current job has finished. Implements #1303.
MKVToolNix GUI: new job queue feature: added a context menu option for setting jobs to status 'pending manual start'
MKVToolNix GUI: chapter editor bug fix: the file is not kept open so that you can open it in other applications at the same time.
MKVToolNix GUI: new merge tool feature: added context menu options for selecting all tracks of a specific type (e.g. all audio tracks). Implements #1197.
MKVToolNix GUI: merge tool enhancement: the dialog shown after dragging & dropping files from external applications asking if those files should be added or appended now has an option to always add and never to show that dialog again. For new MKVToolNix installations the default is now to show this dialog again until the user deactivates it either in the dialog or in the preferences.
MKVToolNix GUI: new feature: added additional ways to move selected files, tracks and attachments around: keyboard shortcuts Ctrl+Up and Ctrl+Down) and optional buttons (those have to be enabled in the preferences). Using drag & drop remains possible. Implements #1279.
MKVToolNix GUI: bug fix: if a GUI language other than English was selected then the warning/error messages output by mkvmerge were not recognized properly and output in the wrong text views.
MKVToolNix GUI: merge tool bug fix: fixed loading saved settings in which an appended file contains chapters/tags/attachments.
MKVToolNix GUI: new merge tool feature: dragging files from external applications now allows you to create new mux settings and add the dropped files to those if the 'always add dropped files' option is off. Implements #1297.
MKVToolNix GUI: new feature: added support for displaying the queue progress on the task bar button. Implements #1335.
mkvmerge: bug fix: fixed handling of MPEG transport streams where all PATs and PMTs have CRC errors. Fixes #1336.
MKVToolNix GUI: new merge tool feature: implemented support for re-ordering new attachments via drag & drop. Implements #1276.
MKVToolNix GUI: bug fix: fixed the command line option used when the Â»fix bitstream timing infoÂ« check box is checked. Fixes #1337.
docs: added a Spanish translation of the man pages
MKVToolNix GUI: enhancement: several drop down boxes have had their options renamed slightly to be more consistent overall and easier to select via the keyboard. Implements #1309.
MKVToolNix GUI: fix compilation with the upcoming Qt 5.5.0. Fixes #1328.
MKVToolNix GUI: job queue bug fix: when re-starting a job the date finishedÂ« field wasn't reset. Fixes #1323.
MKVToolNix GUI: merge tool bug fix: the option 'set output file name relative to first input file' caused the relative path to be applied each time a file was added resulting in the wrong directory. Fixes #1321.
MKVToolNix GUI: merge tool bug fix: when adding a Blu-ray playlist and aborting the Â»select playlist to addÂ« dialog the originally opened playlist was added even so.
mkvmerge: bug fix: the MPEG-1/2 video code was causing an illegal memory access under certain conditions. Fixes #1217 and 1278.
MKVToolNix GUI: bug fix: the 'default subtitle character set' combo box required a selection without an option for using the system's default. An entry Â»â€“ no selection by default â€“Â« has been added at the top.
MKVToolNix GUI: bug fix: fixed parsing command line arguments to an already-running instance on Windows. Fixes #1322.
MKVToolNix GUI: enhancement: position and size of the several additional windows are saved and restored. These include: the preferences window, the dialog for additional command line options, the dialog showing the command line and the dialog for selecting the playlist to add. Implements #1317.
MKVToolNix GUI: bug fix: fixed the combo boxes with languages, countries and character sets not being re-initialized after changes to the list of common languages/countries/character sets in the preferences. Fixes #1224.
MKVToolNix GUI: enhancement: the relative sizes of all splitters are saved and restored. Implements #1306.
MKVToolNix GUI: chapter editor bug fix: fixed the menu entries save to XML fileÂ« and Â»save to Matroska fileÂ« not being available after loading chapters until the tool or tab was changed. Fixes 1312.
MKVToolNix GUI: bug fix: fixed labels and therefore the window becoming excessively wide with long file names. Fixes #1314.
MKVToolNix GUI: merge tool bug fix: fixed the focus marker around combo boxes inside scroll areas not being drawn. Fixes 1310.
MKVToolNix GUI: merge tool bug fix: fixed the stereoscopy mode being off by one. Fixes #1311.
MKVToolNix GUI: merge tool bug fix: fixed the --append-to calculation if more than one file has been appended. Fixes #1313.

New in MKVToolnix 8.1.0 (Jul 11, 2015)

mmg: bug fix: fixed handling of the characters [ and ] in container and track properties.
MKVToolNix GUI: merge tool enhancement: moved the Â»output file nameÂ« controls below the three tabs so they're always visible. Also added an option in the preferences to move them back inside the Â»outputÂ« tab. Implements #1266.
MKVToolNix GUI: new chapter editor feature: added a function for generating a certain number of evenly spaced sub-chapter. Implements #1291.
MKVToolNix GUI: merge tool bug fix: fixed various menu entries not working correctly after closing a tab or switching to another one. Fixes #1301.
MKVToolNix GUI: new chapter editor feature: implemented loading chapter entries from Blu-ray playlists.
MKVToolNix GUI: job queue enhancement: added menu entries for acknowledging both warnings and errors at the same time.
MKVToolNix GUI: merge tool bug fix: if Â»automatically set the file titleÂ« is enabled then the title field will be cleared after all source files have been removed.
MKVToolNix GUI: new watch jobs tool feature: the first tab showing the output of the current job has been changed to show the output of all jobs that have been run since the GUI's been started. This can be turned off in the preferences so that only the output of the currently running job is shown again. Implements #1263.
MKVToolNix GUI: merge tool bug fix: fixed a crash when enabling/disabling chapters coming from an appended file. Fixes #1293.
MKVToolNix GUI: new merge tool feature: added an option to set a directory relative to the first input file as the default output directory. Implements #1261.
MKVToolNix GUI: merge tool bug fix: it was possible to set the Â»default track flagÂ« to Â»yesÂ« for multiple tracks of the same type. Fixes #1289.
MKVToolNix GUI: enhancement: the Â»open fileÂ« dialogs for the chapter and header editor tools will use the same directory that was last used in the merge tool. Fixes #1290.
MKVToolNix GUI: bug fix: fixed reading the Â»default trackÂ« flag of tracks from added Matroska files. Fixes #1281.
MKVToolNix GUI: new feature: added a check box to the track/chapters/tags/attachments list. This offers an additional way of toggling the Â»mux thisÂ« state of entries, same as the drop down box on the right and as double-clicking on the item already did. Implements #1277.
MKVToolNix GUI: merge tool bug fix: when appending files with multiple tracks of a type (e.g. multiple audio tracks) then all tracks of that kind would get assigned to the first track of that kind of the file they're appended to. Now the second audio track from the appended file is appended to the second audio track of the existing file, the third to the third etc. Fixes #1257.
MKVToolNix GUI: merge tool bug fix: fixed automatic output file name re-generation when the mux status of tracks changes. Fixes #1253.
MKVToolNix GUI: new feature: added an option for always using the suggested description and not asking the user when adding a job to the queue. Implements #1288.
MKVToolNix GUI: job queue enhancement: added the shortcut Ctrl+R for the menu entry Â»start all pending jobsÂ«. Implements #1287.
MKVToolNix GUI: new feature: added an option to always treat files dragged & dropped external applications as being added circumventing the question what to do with them (add, append or add as additional parts). This option is enabled by default changing the default behavior from release 8.0.0. Implements #1259.
MKVToolNix GUI: new feature: added an optional action after starting a job or adding one to the queue. This can be either to create whole new settings or to only remove all input files. Implements #1254.
mmg: bug fix: the deprecation warning will only be shown once. Fixes #1252.
Installer for Windows: enhancement: associated the .mtxcfg files with MKVToolNix GUI. Implements #1258.
MIME and desktop files: enhancement: added file associations for .mtxcfg with MKVToolNix GUI. Implements #1258.
MKVToolNix GUI: new feature: implemented command line handling. You can open configuration files, add files to merge jobs, open files in the chapter or header editors. Implements #1209.
mkvmerge: bug fix: fixed recognition of (E)AC3 audio tracks using a FourCC of Â»ec-3Â«. Fixes #1272.
MKVToolNix GUI: merge tool bug fix: fixed attachments not being merged into the file in certain situations. Fixes #1260.
MKVToolNix GUI: merge tool bug fix: fixed showing existing attachments present in source files in the Â»tracks, chapters, tags and attachmentsÂ« list. Fixes #1256.
MKVToolNix GUI: merge tool bug fix: the jobs created when appending files were incorrect resulting in an error message from mkvmerge. Fixes #1271.
mkvpropedit: bug fix: fixed a warning about Â»edit specifications resolving to the same trackÂ« when changing the track properties and setting tags for the same track simultaneously. Fixes #1247.
MKVToolNix GUI: merge tool bug fix: the output/destination file name is cleared when all files are removed. Fixes #1265.
MKVToolNix GUI: merge tool bug fix: fixed command line escaping for empty arguments. Fixes #1270.
MKVToolNix GUI: merge tool bug fix: fixed creating files without a title if one of the input files contains a file title. Fixes #1264.
MKVToolNix GUI: bug fix: if the job removal policy is set to Â»remove even if there were warningsÂ« then jobs that were muxed without warnings weren't removed. Fixes #1262.
Build system: fixed inclusion of desktop files for the two GUIs for Debian/Ubuntu packages. Fixes #1255.

New in MKVToolnix 8.0.0 (Jun 20, 2015)

MKVToolNix GUI: improved locating the mkvmerge executable on non-Windows systems.
MKVToolNix GUI: chapter editor bug fix: dragging & dropping a file onto the chapter editor that cannot be parsed as chapters was causing a confusing warning about changed chapters not being saved.
MKVToolNix GUI: merge tool bug fix: fixed several controls not changing their language correctly when the interface language is changed.
MKVToolNix GUI: merge tool enhancement: drag & drop of files works even if no mux settings are currently open.
mkvmerge: bug fix: fixed codec identification for MP2 audio read from MPEG program/transport streams.
MKVToolNix GUI: job output enhancement: when clicking the »abort« button the GUI asks for confirmation before aborting. Both this check and the one when quitting the application can be turned off via an option in the preferences.
MKVToolNix GUI: job output bug fix: fixed displaying the estimated remaining time in tabs that have been opened for specific jobs.
MKVToolNix GUI: new merge tool, header & chapter editor features: the GUI will ask for confirmation before closing or reloading tabs that have been modified and before quitting if there are modified tabs. This check can be disabled in the preferences.
MKVToolNix GUI: new merge tool feature: implemented an option that allows the user to set up a list of languages. When adding files only those tracks whose language is included in that list are set to be muxed by default.
MKVToolNix GUI: header editor bug fix: fixed the editor assuming values were changed if a track is present whose language element is not present in the file.
MKVToolNix GUI: bug fix: fixed the translation of the tool tip for the »close tab« buttons after changing the interface language.
MKVToolNix GUI: bug fix: appended tracks will be disabled automatically when starting to mux if the track they're appended to has been disabled by the user.
MKVToolNix GUI: new feature: added an option in the preferences for disabling additional lossless compression for all track types.
mkvmerge, MKVToolNix GUI: new feature: added an option (»--engage keep_last_chapter_in_mpls«) that will cause mkvmerge not to remove the last chapter entry from a Blu-ray play list file which mkvmerge normally does if that entry's timecode is within five seconds of the movie's end.
MKVToolNix GUI: fixed updating the number of pending jobs info in the status bar when manually starting jobs.
MKVToolNix GUI: merge tool bug fix: fixed a crash when removing source files.
MKVToolNix GUI: new watch jobs tool feature: implemented estimating the remaining time for both the current job and the whole queue.
MKVToolNix GUI: merge tool bug fix: the default settings for the »output directory policy« was changed to »same directory as the first input file«.
MKVToolNix GUI: enhancement: the following dialogs can now be maximized: the »preferences« dialog; the »additional command line options« dialog; the dialog showing the command line; the dialog where the user selects the play list to add.
MKVToolNix GUI: merge tool enhancement: pressing delete when the source files view is focused will cause the selected source files to be removed.
MKVToolNix GUI: merge tool enhancement: implemented toggling of »mux this« for all selected tracks by either double-clicking on the tracks or pressing enter/return when the tracks view is currently focused.
MKVToolNix GUI: job queue enhancement: added a menu entry for starting all jobs pending manual start.
MKVToolNix GUI: enhancement: the text in all message box dialogs can now be selected & copied, even on Windows.
all: the detection whether or not the applications are installed on Windows is done by checking for the presence of a special file in the program folder instead of checking for an entry in the registry written by the installer. This enables users to try new portable versions without having to uninstall an installed version first as their settings will be kept separate now. A side effect is that compatibility with Windows XP should be restored.
MKVToolNix GUI: bug fix: on Windows the job queue was accidentally always saved to and loaded from the registry even if the portable version was used.
MKVToolNix GUI: job queue bug fix: fixed accidental duplication of lines when using drag & drop in certain ways.
MKVToolNix GUI: bug fix: if a job is running when the user wants to quit requires confirmation from the user that the running job should be aborted.
MKVToolNix GUI: bug fix: fixed the initial status display when viewing a job's output from the queue.
MKVToolNix GUI: bug fix: running jobs cannot be removed from the job queue anymore.
MKVToolNix GUI: bug fix: when starting the GUI old jobs from the queue were silently discarded if they included additional parts (e.g. VOBs).
MKVToolNix GUI: bug fix: job queue: when saving the job queue jobs removed in the GUI were not removed from the stored settings.
MKVToolNix GUI: bug fix: when viewing the job output of a job that hasn't been run yet the »save output« button was enabled.
mkvmerge, mkvpropedit: bug fix: fixed an invalid memory access leading to a crash in the Base 64 decoder.
MKVToolNix GUI: bug fix: fixed progress parsing for interface languages other than English.
mkvmerge: enhancement: if running in GUI mode (parameter »--gui-mode«) then the progress will be output as the untranslated »#GUI#progress â€¦%« in order to facilitate parsing of progress by GUIs.
mkvmerge: bug fix: fixed key frame designation for video tracks in MP4 DASH files.
mkvmerge: bug fix: the track statistics tags of Matroska source files are always discarded, no matter whether or not they're to be created for the output file. That way they won't be reported as track tags by mkvmerge's identification mode. This makes it easier for the user to create output files without track statistics tags as (s)he only has to use the option »--disable-track-statistics-tags« and not disable all the track tags as well anymore.
mkvmerge, mkvinfo, mkvextract: bug fix: fixed a crash with certain types of invalid Matroska files.
all: bug fix: removed some unused code thereby fixing compilation on OpenBSD
MKVToolNix GUI: bug fix: fix alignment of the tool contents with the tool selector at the bottom.
MKVToolNix GUI: new feature: added a »help« menu with links to several parts of the MKVToolNix documentation.
MKVToolNix GUI: job output tool: added a button for acknowledging the warnings/errors produced for the job shown.
MKVToolNix GUI: merge tool: the »save« button has been removed in favor of the »save « menu entries. This also improves consistency with the other tools.
MKVToolNix GUI: enhancement: header editor: made the meaning of the »Reset« button clearer with a better label and an additional tool tip.
MKVToolNix GUI: enhancement: the tabs for the tools that haven't been implemented yet (extraction, info and the tag editor) are not shown anymore.
MKVToolNix GUI: bug fix: header editor: fixed the track language shown if the element is not present in the file.
MKVToolNix GUI: bug fix: when browsing the output file name the currently entered file name is pre-selected in the dialog.
MKVToolNix GUI: enhancement: the update check dialog showing the change log can now be maximized.
MKVToolNix GUI: new feature: implemented viewing the output of any job in the job queue.
MKVToolNix GUI: new feature: implemented saving the job output to a file.
MKVToolNix GUI: enhancement: language and country drop-down boxes will contain the common languages/countries both at the top as well as in the full list.
MKVToolNix GUI: enhancement: the entry »Undefined (und)« is always shown at the top of the language drop-down boxes.
MKVToolNix GUI: enhancement: the number of new warnings and errors are shown in the status bar. Both counters can be acknowledged via context menus on the status bar and in the job queue view.
MKVToolNix GUI: enhancement: the number of jobs pending automatic/manual execution is listed in the status bar.
MKVToolNix GUI: enhancement: the progress widget in the stats bar is not reset to 0 once all the jobs have been processed in order to signal the user that the jobs have actually been processed.
MKVToolNix GUI: merge tool enhancement: a short animation of a moving icon is shown when a job is started or added to the job queue as a clue to the user what's happening and where to look for output. This animation can be disabled in the preferences.
MKVToolNix GUI: job output bug fix: fixed superfluous empty lines in job output/warning/error output.
MKVToolNix GUI: merge tool bug fix: when adding a VOB from a DVD the tree items for the additional parts (the other VOBs processed automatically) weren't shown.
MKVToolNix GUI: merge tool: fixed the scroll bar not disappearing in the input tab if the window is high enough.
MKVToolNix GUI: chapter editor enhancements: when selecting a chapter the the chapter name closest to the previously selected chapter name (or the first if there wasn't a previously selected one) is selected automatically.
MKVToolNix GUI: chapter editor enhancements: when starting a new file a single edition and a single chapter are added automatically.
MKVToolNix GUI: merge tool enhancement: the »add files« button has been re-labeled »add source files« in order to make it clearer that it cannot be used for adding attachments, even if the attachments tab is the currently selected tab.
MKVToolNix GUI: merge tool & job queue tool enhancement: short tool tips will be shown for the files, tracks, attachments and jobs views telling the user to right-click for adding files and similar actions.
MKVToolNix GUI: new feature for the merge tool, the header and chapter editors: if no file is open then »new« and »open file« buttons are shown.
build system: desktop files and icons were only installed if wxWidgets was enabled. Fixes #1188.
man pages: clarify functionality of --default-duration.
build system: bug fix: fixed running rake if no locale or one with an encoding other than UTF-8 is set.

New in MKVToolnix 7.9.0 (May 11, 2015)

build system: configure will now check for Qt by default. If at least v5.2.0 is found then the Qt versions of mkvinfo's GUI and the new mkvtoolnix-gui will be enabled. You can affect this detection with the options --disable-gui (turns off all GUIs; works the same as before), --disable-qt (will compile the wxWidgets GUI for mkvinfo and mmg) and --without-mkvtoolnix-gui will compile the Qt version of mkvinfo's GUI but no mkvtoolnix-gui).
mkvinfo: bug fix: mkvinfo would exit with the wrong return code 0 instead of 2) if a non-existing file name had been given. Fixes 1182.
mkvmerge: Two more characters are now escaped in the container and track properties output in verbose identification mode: [ is replaced with \b and ] with \B. This is needed for reliable parsing by other programs, e.g. GUIs.
MKVToolNix GUI: new feature: added context menu entries for tracks: 'select all', 'enable all' and 'disable all'.
MKVToolNix GUI: new feature: implemented aborting the currently running job.
all: fix compilation on Mac OS in common/command_line.cpp due to boost::range::filtered requiring a copyable functor. Fixes #1175.
all: fix compilation on Mac OS in common/version.cpp due to wrong usage of std::stringstream and ostream operators. Fixes 1176.
MKVToolNix GUI: new feature: implemented the additional command line options dialog.
MKVToolNix GUI: new feature in the chapter editor: added features Â»set the language/country of the selected chapter and its sub-chapters.
all: bug fix: fixed compilation with Boost 1.58.0. Fixes #1172.
mkvmerge: bug fix: Fixed a segmentation fault during cleanup after Ctrl+C was pressed. Fixes #1173.
MKVToolNix GUI: new feature in the chapter editor: added features clamping time stamps of sub-chapters to their parent's time stamps, expanding time stamps of chapters to encompass their sub-chapters' time stampsÂ« and shifting start and end time stamps by an offset.
all: permanently removed the build times tamp from the version information and the corresponding configure option.
MKVToolNix GUI: new feature: the main window's size, position and state (maximized/minimized) is saved on exit and restored on startup.
MKVToolNix GUI: new feature: the GUI is now fully translatable. The German translation has been completed for the GUI, too.
mkvmerge: bug fix: fixed --sync not doing anything if default-duration is used for the same track, too.
mkvmerge: bug fix: fixed aborting file identification with an error message about 'aac_error_protection_specific_config' that happened for some files. Fixes #1166.
MKVToolNix GUI: new feature: implemented changing the interface language.
MKVToolNix GUI: enhancement: implemented often used subtitle character sets.
MKVToolNix GUI: enhancement: implemented setting a user configurable subtitle character set by default.
MKVToolNix GUI: enhancement: implemented the automatic removal of jobs configurable by the user.
mkvmerge: bug fix: fixed specifying track properties like language or name for AC3 cores embedded in TrueHD tracks when they're read from raw thd+ac3 files. Fixes #1158.
mkvmerge: enhancement for MPEG program stream handling: mkvmerge will only look for additional files automatically if the source file begins with 'VTS_â€¦' and just if it ends in a number. E.g. when reading 'video_1.mpg' another file called 'video_2.mpg'' will no longer be read automatically. Implements 1164.
MKVToolNix GUI: enhancement: display country names in addition to country codes.
MKVToolNix GUI: enhancement: implemented often used languages and country codes.
MKVToolNix GUI: chapter editor enhancement: implemented defaults for the language and country settings for newly created chapter names.
MKVToolNix GUI: merge tool enhancement: added controls for mkvmerge's 'reduce audio to its core' and 'force NALU size length' features.
MKVToolNix GUI: new feature: implemented the 'Preferences' dialog (not all of the functionality the options refer to has been implemented yet, though).
mkvmerge: bug fix: MPEG-1/2 parser: fixed a long-standing issue that prevented mkvmerge from recognizing certain MPEG-1/2 video tracks and files if the frame's sequence numbers didn't follow a certain expected pattern. Fixes #1162 and probably others like 1145 or #1099.
MKVToolNix GUI: merge tool enhancement: Implemented adding and append files and adding files as additional parts via drag & drop from external applications.
MKVToolNix GUI: merge tool bug fix: fixed the column headers on the 'attachments' tab.
MKVToolNix GUI: chapter editor enhancement: implemented opening files via drag & drop from external applications.
MKVToolNix GUI: enhancement: The portable Windows version will store its settings in a file in the same folder instead of the registry.
MKVToolNix GUI: enhancement: Qt's Â»Windows VistaÂ« style is now used on Windows instead of the old, Windows 98-like Â»WindowsÂ« style.
MKVToolNix GUI: merge tool enhancement: The merge tool has been re-written to be tabbed like the header and chapter editors allowing for multiple merge job settings to be open at the same time.
MKVToolNix GUI: chapter editor enhancement: implemented re-ordering chapters and editions with drag & drop.
MKVToolNix GUI: new feature: implemented the chapter editor.
MKVToolNix GUI: merge tool enhancement: implemented adding attachments via drag & drop from external applications.
MKVToolNix GUI: new feature: implemented the header editor.
mkvmerge: enhancement: Implemented proper type output during identification for DTS-ES (extended surround) tracks. Implements 1157.
MKVToolNix GUI: new feature: implemented the online update check.
mkvmerge: bug fix: The calculation of the width and height of h.265/HEVC video tracks did not take the conformance window cropping) into account. Fixes #1152.
mkvmerge: bug fix: Fixed the value of the DocTypeVersion header field if any of the Matroska elements CodecDelay, DiscardPadding or SeekPreRoll is used. This is the case for Opus tracks.
mkvmerge: bug fix: Fixed the handling of E-AC3 tracks in M2TS files if the AC3 core and the extension are stored in separate packets.
mkvmerge: new feature: Implemented support for the DTS-HD container format.
mkvmerge: new feature: Implemented support for core-less DTS streams consisting solely of XLL extension sub-streams.
mkvmerge: new feature: track selection can be done by language codes as well. Affects the options --audio-tracks, button-tracks, --subtitle-tracks and --video-tracks. Works only for containers that actually provide a language tag. Implements 1108.
source code: bug fix: Accidental uses of the 'long double' type have been converted to normal 'double'. This fixes compilation on platforms which don't support the 'long double' type in combination with Boost::Math. Fixes #1150.

New in MKVToolnix 7.8.0 (Mar 28, 2015)

build system: Boost's »Math« library is now required.
mkvmerge: bug fix: HEVC tracks which did not have an aspect ratio present in their sequence parameter set were copied incorrectly; the resulting sequence parameter set was invalid. Fixes #1081.
mkvextract: bug fix: When extracting HEVC tracks mkvextract will use the same start code lengths that x265 uses (four bytes 0x00000001 for the first and video/picture/sequence parameter set NALs and three bytes 0x000001 for all others).
mkvmerge: enhancement: File type identification will output a more detailed description of the DTS type for DTS audio tracks (DTS-HD Master Audio, DTS-HD High Resolution, DTS Express or just plain DTS). Implements #1109.
mkvmerge: new feature: Implemented support for DTS Express.
mkvmerge: bug fix: The number of channels in DTS tracks with more than six channels is now recognized correctly by parsing the DTS HD extensions, too. Fixes #1139.
all: new feature: added a Swedish translation of the programs by Kristoffer Grundström (see AUTHORS).
mkvmerge: bug fix: Fixed handling of the BITIMAPINFOHEADER extra data size handling during merging and extraction for codecs like HuffYUV.
mkvmerge: bug fix: When appending unframed HEVC/h.265 tracks and setting the default duration the second and all following source parts will use the same default duration as set for the first part. Fixes #1147.
mkvmerge: bug fix: enabled the use of tags in WebM files. Tagging elements not supported by the WebM specs are removed. Fixes #1143.
mkvmerge: bug fix: fixed detection of audio tracks in QuickTime files whose FourCC code is unknown to mkvmerge.
mkvmerge: bug fix: fixed detection of video tracks in QuickTime files whose FourCC code is unknown to mkvmerge.
mkvextract: bug fix: Fixed VobSub file naming when mkvextract is built against Boost::Filesystem older than 1.50.0. Fixes #1140.
mkvmerge: bug fix: fixed detection of Cinepak video tracks in QuickTime files.
mkvmerge: bug fix: fixed detection of PCM audio tracks in QuickTime files using the »raw « FourCC.
mkvmerge: bug fix: fixed detection of tracks in Flash Video files for which the headers do not signal a track.
mkvmerge: bug fix: fixed a segfault in the Flash Video file format reader.
mmg: The change making the window wider by default has been reverted.
mkvmerge: bug fix: Fixed file type detection for MP3 files with big ID3 tags at the start of the file (e.g. if they contain cover images).
mkvinfo (Qt interface): enhancement: implemented support for opening files via drag & drop.
mkvmerge: enhancement: added an option (--engage no_delay_for_garbage_in_avi) for disabling deriving a delay from garbage in audio tracks in AVI files. Requested in #1137.
mkvmerge: bug fix: The formula used for calculating the audio delay for garbage data at the start of tracks in AVI files has been fixed. Fixes #1137.

New in MKVToolnix 7.7.0 (Mar 9, 2015)

source code: Fixed the compilation on cygwin.
documentation: The Dutch, Ukrainian and Chinese (Simplified) manual pages have contained only untranslated English strings since release 7.0.0. This was due to the files holding the translatable strings having being corrupted by a misbehaving tool in the build process. This has been rectified. Fixes #1134,
mkvmerge: bug fix: Fixed reading all of the private codec data in AVIs from the 'strf' chunk for codecs that don't set biSize to include that data. Fixes #1129
mkvextract: bug fix: Fixed writing AVIs with ckSize fields that were too large. Fixes #1128
mmg: new feature: added a button Â»toggle allÂ« that enables or disables all tracks. It at least one track is currently disabled then all tracks are enabled when pressing that button. Otherwise if all tracks are currently enabled) then they will all be disabled. Implements #1130.
mmg: new feature: added a new checkbox Â»reduce to audio coreÂ« on the Â»format-specific optionsÂ« tab that passes the new reduce-to-core option to mkvmerge if enabled. Part of the implementation of #1107.
mkvmerge: bug fix: fixed determining the key frame status in certain AVIs (those whose dwFlags index field has more bits set than just 0x10).
build system: new feature: added configure options for building statically-linked binaries (--enable-static). Patches by Florent ThiÃ©ry. Implements #1119.
mkvextract: new feature: implemented a mode for extracting cue information.
mkvinfo (Qt interface): bug fix: added WebM extensions to the known types in the 'Open file' dialog.
mkvextract: bug fix: Fixed writing AVIs with the wrong bit depth for video codecs that don't use 24 bits/pixel. Fixes #1123.
mkvmerge: bug fix: Fixed recognition of E-AC3 audio tracks in MPEG transport streams if they use the type ID 0xa1 (and the same for DTS tracks stored with type ID 0xa2). Fixes #1126
mkvextract: bug fix: Fixed VobSubs being written to the wrong directory if the output file name given by the user didn't have an extension but one of the directories contained a dot. Fixes #1124
mkvpropedit, mmg's header editor: bug fix: if updating the file required creating an EBML void for a 130 bytes long gap then the void element created was one byte too short resulting in an invalid file structure. Fixes #1121
mkvmerge: bug fix: If the MP4 track headers for MP3 tracks contain invalid values (number of channels is 0 or the sampling rate is 0) then mkvmerge will re-derive these parameters from the MP3 bitstream instead of ignoring that track
mkvmerge: bug fix: Matroska reader: track-specific tags weren't copied for tracks for which the pass-through packetizer was used e.g. those with the codec ID A_MS/ACM) instead of a specialized one.
mkvmerge: enhancement: The code for determining the time codes of AAC, AC3, DTS, MP3 and TrueHD packets has been completely rewritten. This improves how timecodes are kept if the sourcecontainer provides them in many cases.
mkvmerge: removal: AAC: The hack for using the old codec IDs e.g. A_AAC/MPEG4/LC/SBR) for AAC tracks has been removed. Those codec IDs have been deprecated for nearly ten years. Reading files that use those IDs will stay supported.
mkvmerge: removal: TrueHD: The hack for merging a sync frame and all following normal frames into a single Matroska packet has been removed as there are no players that can play such merged frames anyway.
mkvmerge: new feature: Added an option Â»--reduce-to-coreÂ« that tells mkvmerge not to copy HD extensions for DTS tracks. Part of the implementation of #1107.
mkvmerge: new feature: mkvmerge will now recognize TrueHD tracks inside MPEG transport streams that contain an AC3 core as consisting of two tracks. Instead of always dropping the AC3 part the user can simply select which tracks to keep. Part of the implementation of #1107.
mkvmerge: new feature: mkvmerge will now recognize TrueHD+AC3 files as consisting of two tracks. Instead of always dropping the AC3 part the user can simply select which tracks to keep. Part of the implementation of #1107.

New in MKVToolnix 7.6.0 (Feb 9, 2015)

New in MKVToolnix 7.5.0 (Jan 5, 2015)

mkvmerge: bug fix: If the target drive is full then a nicer error message is output instead of simply crashing due to an uncaught exception
mkvmerge: bug fix: Fixed reading MPEG transport streams in which all PATs and/or PMTs have CRC errors. Fixes #1100
all: bug fix: Re-wrote the whole checksum calculation code. This lead to a fix for the Adler32 checksum algorithm that was triggered under certain circumstances. Adler32 is used in mkvinfo's output (e.g. in summary mode or if checksums are activated), in the h.265/HEVC bitstream and TrueAudio TTA) file headers
mkvmerge: bug fix: fixed handling of HE-AACv2 with object type parametric stereo«
mkvmerge: new feature: implemented support for MP4 DASH files. Implements #1038
mkvmerge: new feature: implemented reading MPEG-H p2/HEVC video tracks from MP4 files. Implements #996
mkvinfo: bug fix: track statistics: the duration (and therefore the estimated bitrate) was wrong for files in which the frame with the maximum timecode wasn't the last frame in the file. Fixes 1092
mkvmerge: new feature: implemented support for AAC in LOAS/LATM multiplex if read from MPEG transport streams or raw LOAS/LATM AAC files. Implements #877 and fixes the underlying issue in #832
build system: libEBML and libMatroska have been changed to provide pkg-config configuration files. Therefore MKVToolNix' build system has been switched to look for both libraries via pkg-config
all: bug fix: several fixes have gone into libEBML and libMatroska that prevent illegal memory access (both reading from and writing to unallocated addresses). The bugs #1089 and #1096 have thus been fixed
build system: libMatroska v1.4.2 is now required as part of a fix for #1096
build system: libEBML v1.3.1 is now required as a part of a fix for #1089
mkvinfo: bug fix: mkvinfo will abort with a proper error message if the first element found is not an EBML head element. See #1089
all: enhancement: improved exception messages that can occur when reading damaged Matroska files to make it clearer for the user what's happening. See #1089
mkvmerge: new feature: Added support for reading h.265/HEVC video tracks from MPEG transport streams. Implements #995
mkvinfo: bug fix: Timecodes output with ms resolution are now rounded to ms instead of simply cut off. Fixes #1093

New in MKVToolnix 7.4.0 (Dec 13, 2014)

New in MKVToolnix 7.3.0 (Oct 23, 2014)

mkvmerge: new feature: implemented support for reading teletext subtitles from MPEG transport streams. They're converted to SRT-style subtitles (CodecID S_TEXT/UTF8). Implements #773.
mkvmerge: bug fix: probing MPEG transport streams with certain types of broken MPEG-2 inside caused mkvmerge to exit with an error message. Such tracks are now ignored instead.
mkvmerge, mmg's chapter editor: fixed the default value for the Â»languageÂ« element if it isn't present in a chapter XML file.
MKVToolNix GUI: implemented drag & drop in the files pane.
mkvinfo (Qt version on Windows): bug fix: the console window is closed if the GUI is launched.
mkvmerge: bug fix: Reading tracks from MPEG transport streams resulted in the track being cut off at points with a five minute gap in between frames. It is due to timecode wrap detection introduced in v6.9.0. As it affects subtitles the most the wrap detection has been relaxed for them.
MKVToolNix GUI: implemented drag & drop in the track pane.
mkvmerge: new feature: added support for PCM in MPEG program streams (.vob â€“ DVDs) and transport streams (.ts, .m2ts â€“ Blu-rays). Implements #763.
MKVToolNix GUI: fixed missing command line switch for audio sync/stretch.
MKVToolNix GUI: implemented drag & drop in the job queue.
MKVToolNix GUI: implemented storing the job queue when the application exits and retrieving it when it starts again.
Installer: bug fix: the shortcut for the GUI preview on the desktop is removed upon uninstallation. If the user opts not to have shortcuts on the desktop then no shortcut is created for the GUI preview either.
MKVToolNix GUI: fixed clearing the file/track/attachment lists when starting a new config or when loading an existing one.
MKVToolNix GUI: implemented setting the output file name automatically in four different modes (don't set at all; place in previous output directory; place in fixed output directory; place in parent directory of first source file) with an option to make them unique by appending a running number.
MKVToolNix GUI: implemented setting the file title automatically from added files that already have a title.

New in MKVToolnix 7.2.0 (Sep 15, 2014)

New in MKVToolnix 7.1.0 (Jul 28, 2014)

New in MKVToolnix 7.0.0 (Jun 10, 2014)

mkvmerge: enhancement: In addition to the track statistics tags BPSÂ«, Â»DURATIONÂ«, Â»NUMBER_OF_BYTESÂ« and Â»NUMBER_OF_FRAMESÂ« mkvmerge will write two more tags identifying which application wrote the statistics (Â»_STATISTICS_WRITING_APPÂ«) and when the file in question was written: Â»_STATISTICS_WRITING_DATE_UTCÂ«. STATISTICS_WRITING_APPÂ« will always contain the same string contained in the segment info header element Â»WritingAppÂ«. STATISTICS_WRITING_DATE_UTCÂ« will contain the same timestamp as in the segment info header element Â»DateÂ«, though STATISTICS_WRITING_DATE_UTCÂ« is actually a string representation instead of an integer value.
Additionally a tag named Â»_STATISTICS_TAGSÂ« is written containing the names of the tags that mkvmerge has set automatically. It equals the following currently: Â»BPS DURATION NUMBER_OF_BYTES NUMBER_OF_FRAMESÂ«.
build system: Boost's "date/time" library is now required.
mkvmerge: bug fix: If a single subtitle track contains two or more entries at the same timecode then the cue duration and cue relative position elements written were wrong.
mkvinfo: bug fix: fixed wrong progress percentage shown during saving the information to text files. Fixes #1016.
mkvmerge: new feature: Added a global option for disabling writing the tags with statistics for each track: disable-track-specific-tags.
mkvmerge: new feature: When identifying a Matroska file in verbose identification mode track-specific tags will be output as well. The format is Â»tag_:Â», e.g. for a tag named Â»BPSÂ« with the value Â»224000Â« the output would be Â»tag_bps:224000Â«. Enhancement for #1021.
mkvmerge: new feature: mkvmerge will write track-specific tags with statistics (Â»BPSÂ« for the average number of bits per second, DURATIONÂ« for the duration, Â»NUMBER_OF_BYTESÂ« and NUMBER_OF_FRAMESÂ« for the track's size in bytes and its number of frames/packets). Implements #1021.
mkvmerge: bug fix: Changed the file type detection order again. The text subtitle formats are now probed after those binary formats that can be detected quickly and unambiguously. This avoids some mis-detection if e.g. Matroska files as ASS text subtitles if they do contain such a track.
mmg: enhancement: The chapter editor will only use fast-mode parsing when loading chapters from Matroska files.
all: bug fix: fixed invalid memory access in the cleanup procedures which only occurred if the output was redirected with the Â»--redirect-outputÂ« command line parameter.
mkvmerge: enhancement: The last chapter entry read from MPLS files is removed if it is at most five seconds long.
mkvmerge: enhancement: added the attachment UID to the verbose identification output of Matroska files.
mmg: bug fix: Selecting a subtitle track correctly sets the character setÂ« drop-down box if no character set was set for this track. Fixes #1008.
mmg: enhancement: the subtitle character set cannot be set anymore for subtitle tracks read from Matroska files as mkvmerge ignores that setting for said container anyway (text subs are always encoded in UTF-8 in Matroska).
mmg: enhancement: mmg will look for the Â»mkvmergeÂ« executable in the same directory as the Â»mmgÂ« executable is located it if the location hasn't been set by the user on all operating systems before: only on Windows). Improves detection if Â»mkvmergeÂ« is not in the $PATH.

New in MKVToolnix 6.9.1 (Apr 21, 2014)

New in MKVToolnix 6.9.0 (Apr 18, 2014)

New in MKVToolnix 6.8.0 (Mar 4, 2014)

mkvmerge, mkvextract: new feature: added support for h.265/HEVC by merging the patches from DivX/Rovi Corp. So far HEVC is only supported as elementary streams and read from other Matroska files.
mkvmerge: enhancement: The deprecated ISO 639-1 code "iw" is now recognized for Hebrew.
mkvmerge: bug fix: The AC3 packetizer will re-derive the sampling frequency and the number of channels from the bitstream. This way obviously invalid information from the source container like a sampling frequency of 0 Hz will be fixed.
mkvmerge: enhancements: AVI reader: audio chunks with obvious wrong size information (bigger than 10 MB) will be skipped.
mkvmerge: bug fix: When reading M2TS files belonging to an MPLSplaylist mkvmerge will now only copy packets whose timestamps lie between the Â»in timeÂ« and Â»out timeÂ« restrictions from the playlist's entry corresponding to that M2TS file. Fixes #985.
all: Windows 64bit: fixed return value checks for opening files. Fixes #972.
all: Windows: when redirecting the program's output with cmd.exe e.g. Â»mkvinfo file.mkv > info.txtÂ«) the programs will no longer write two line feed characters (\r) per carriage return character n). Fixes #970.
all: Windows: the default charset for the files created with redirect-outputÂ« has been changed from the system's local charset to UTF-8. Just like before it can be changed with output-charsetÂ«. See #970.
all: bug fix: Windows: messages written to the console (cmd.exe)
are not re-encoded to the local charset and back to UTF-16 before they're handed over to ConsoleWriteW(). This fixes outputting Unicode characters to the console that are not part of the local charset. Fixes #971.
extract: bug fix: using names of non-existing files in attachmentsÂ«, Â»chaptersÂ«, Â»cuesheetÂ« or Â»tagsÂ« mode caused mkvextract to crash instead of emitting a proper error message. Fixes #964.
mmg: bug fix: fixed the check for WebM-compatible track types for Opus.
mkvmerge: bug fix: fixed muxing Sorenson v3 (SVQ3) video from QuickTime files.
mkvmerge, mkvextract, mkvpropedit: enhancement: attachments in Matroska files with a missing FileUID element are not ignored anymore even though they violate the specs. mkvmerge generates a new FileUID instead.
mkvmerge: re-built with the 64bit build for Windows with a newer compiler version in order to fix #957.
mmg: bug fix: mkvmerge's file identification is written to a temporary file with --redirect-output and from there into mmg instead of directly from mkvmerge. This prevents from character re-coding done by wxWidgets 3.0.0 on Windows. Fixes #959.
installer: enhancement: the architecture (32bit vs 64bit) is mentioned in the interface.
installer: bug fix: the installation directory for 64bit builds will default to the proper directory (Â»C:\Program FilesÂ« instead of Â»C:\Program Files (x86)Â«). Fixes #956.

New in MKVToolnix 6.7.0 (Jan 9, 2014)

build system: Ruby 1.9.x is now required.
all: enhancement: The architecture (32bit/64bit) is mentioned in the version information of all programs.
build system: bug fix for 64bit builds on Windows x86_64-w64-mingw32): use the correct processor architecture via separate Windows manifest files. Fixes mmg and mkvinfo not starting due to Â»error 0x0000007bÂ«.
mkvmerge: bug fix: Fixed a potential endless loop due to an integer overflow in the code removing AVC/h.264 filler NALUs.
mkvmerge: bug fix: Fixed reading uncompressed PCM audio tracks from QuickTime/MP4 files in certain situations. Fixes #950.
mmg: enhancement: Made the Â»scanned filesÂ« list box sortable by all columns. Fixes #954.
mmg: enhancement: The Â»additional partsÂ« dialog will now show the files that make up an MPLS playlist. This is for informational purposes only and doesn't allow changing the playlist itself.
mkvmerge: bug fix: Reading from an MPLS playlist file is now done as if the second and following files referenced in that playlist had been appended to the first file from that playlist. Before they were treated as if they were additional parts. Fixes #934.
mmg: enhancement: a couple of fixes to tooltips: 1. Content correction for Â»splitting by chaptersÂ«; 2. no ugly re-formatting with wxWidgets 3.0.0 on Windows.
mkvmerge: bug fix: Improved the AAC, AC3 and MP3 header decoding error handling so that the corresponding parsing routines won't get stuck in endless loops when encountering certain garbage data patterns.
mkvmerge: enhancement: unified codec names output by mkvmerge's identification mode for all file format readers.
mkvinfo: bug fix: when setting the language with --ui-language a few strings were still translated using the system's default language.
mkvextract: bug fix: if the track headers were located at the end of the file (e.g. after modification with mkvpropedit or mmg's header editor) then mkvextract was writing files with a length 0 bytes.
mmg: bug fix: the Â»playlist itemsÂ« list box in the Â»select playlist file to addÂ« dialog was showing the items in reversed order. Fixes #952.
mmg: bug fix: the Â»select playlist file to addÂ« dialog can now be resized, minimized and maximized. It also remembers its position and size during runs. Fixes #951.
mmg: enhancement: The user can select the default subtitle character set to use for newly added subtitle tracks in the preferences dialog as requested in bug #948.
mmg: bug fix: fixed the tooltip for the subtitle character set drop-down box to match mkvmerge's actual behavior. Fixes #948.
mkvmerge: new feature: implemented reading DTS audio tracks from MP4 files (with ESDS object type ID == 0xA9 (decimal 169) or FourCC == 'DTS ' or 'dtsc').
mkvmerge: enhancement: allowed muxing Opus to WebM files.
mkvmerge: bug fix: Fixed the mapping of the Opus element Â»seek pre-rollÂ« and Â»pre-skipÂ« to the Matroska elements Â»track seek pre-rollÂ« and Â»codec delayÂ«. Remuxing Matroska files without Opus created with earlier versions of MKVToolNix is enough to fix such a file.
mkvmerge: bug fix: fixing the bitstream timing information of h.264/AVC writes clean values for 25000/1001 frames per second video (e.g. de-telecined PAL @ 29.97).
mmg: bug fix: fixed a crash in during drag & drop operations in mmg's chapter editor.

New in MKVToolnix 6.6.0 (Dec 2, 2013)

New in MKVToolnix 6.5.0-1 (Oct 21, 2013)

New in MKVToolnix 6.4.1 (Sep 17, 2013)

New in MKVToolnix 6.4.0 (Sep 16, 2013)

New in MKVToolnix 6.3.0-1 (Jun 29, 2013)

New in MKVToolnix 6.3.0 (Jun 28, 2013)

New in MKVToolnix 6.2.0 (Apr 29, 2013)

bug fix: The option "--engage remove_bitstream_ar_info" will now work on AVC/h.264 tracks read from Matroska/MP4 files as well. Fixes #868.
mmg: bug fix: mmg will now handle all file names given on the command line instead of only the first one. This allows things like opening several selected files with mmg in Windows, and mmg will add all of them. Fixes #867.
mkvmerge: bug fix: The amount of memory required to store the cues during muxing has been reduced drastically. This is more noticeable the more video and subtitle tracks are muxed. Fixes #871.
mkvmerge: bug fix: If splitting had been active then the elements "cue duration" and "cue relative position" were only written to the first output file.
mkvmerge: bug fix: The "CTS offset" field of FLV files with AVC/h.264 video tracks is now read as a signed-integer field in accordance with the FLV specifications.
mkvmerge: bug fix: DTS parsing: no more warnings about incompatible encoder revision numbers will be printed. Fixes #866.
mkvextract: enhancement: track extraction mode: If mkvextract encounters a broken file structure it will output the last timecode successfully read before resyncing. After the resync the first cluster timecode will be reported as well.
installer: The installation directory will no longer be added to the PATH environment variable.
mkvmerge: bug fix: The parsing of the AAC AudioSpecificConfig structure (the bytes contained in Matroska's CodecPrivate and in MP4's "ESDS" atom) was fixed to support parsing the GASpecificConfig and the ProgramConfigElement if the channel configuration is 0. Fixes #872.
mmg: bug fix: Loading chapters from Matroska files will open the file in read-only mode allowing to read from write-protected files.
mkvmerge: bug fix: All entries in chapters imported from MPLS playlists were named "Chapter 0". The numbering has been fixed. Fixes #870.
mkvmerge: new feature: Selecting the lowest process priority with "--priority lowest" will cause mkvmerge to also select an idle/background I/O priority. Implements #863.
mkvmerge: bug fix: Fixed reading AVI files with audio chunks of size 0. Fixes #843.
mmg: new feature: Add control for new option "--fix-bitstream-timing-information".
mkvmerge: new feature: Add option for fixing the timing information in video track bitstreams (--fix-bitstream-timing-information).
mkvmerge: enhancement: Matroska reader: If mkvmerge encounters a broken file structure it will output the last timecode successfully read before resyncing. After the resync the first cluster timecode will be reported as well.
mkvmerge: bug fix: MPEG program stream reader: tracks with invalid video properties (e.g. width or height = 0) are ignored properly.
mkvmerge: bug fix: The progress percentage was sometimes using the wrong input file as the reference if multiple files are read with the "additional parts" mechanism (on the command line: the syntax "( VTS_01_1.VOB VTS_1_2.VOB VTS_1_3.VOB )".
mkvmerge: bug fix: Fixed one situation that could lead to mkvmerge aborting with the error message "Re-rendering track headers: data_size != 0 not implemented yet".
mkvmerge: removal: Support for BZ2 (bzlib) and LZO (lzo1x) compression has been removed.
mmg: bug fix: Using drag & drop to add playlists will no longer lock the dragging application (e.g. Windows Explorer) in D&D mode for the duration of the scan for other playlists.
mmg: bug fix: The validation for the argument to "split by chapters" was wrongfully rejecting certain valid inputs (chapter number lists in which the second or any later chapter number was higher than 9).
all: enhancement on Windows: all programs now determine the interface language to use from the user's selected interface language (C function "GetUserDefaultUILanguage()"), not from the locale setting. Implements #852.

New in MKVToolnix 6.1.0 (Mar 4, 2013)

mkvmerge: bug fix: Fixed mkvmerge sometimes mistakenly detecting MPEG-1 video in MPEG program streams as AVC/h.264. Fixes #845.
mmg: new feature: When a playlist file (e.g. MPLS Blu-ray playlist) is added mmg can optionally scan all the other files in the directory that have the same extension and present the user with the results (including them playback time, total size, number of chapters, number and types of tracks). The user can then select the actual playlist file to add. The user can configure the minimum playlist duration in order to filter out too short ones.
mmg: new feature: Added an option for disabling making the suggested output file name unique by adding a running number e.g. ' (1)'). Implements #848.
mmg: new feature: The output file name can be auto-set to be located in the first input file's parent directory. Implements 849.
mkvinfo, mkvpropedit, mmg's header editor: bug fix: Fixed the description for the DisplayUnit element to include value 3 "aspect ratio").
documentation: Added a Dutch translation of mmg's guide
mkvmerge: bug fix: Fixed handling chapters when splitting by parts (both parts/timecodes and parts/frames). Fixes #831.
mkvmerge: bug fix: Fixed reading certain MP4 atoms with invalid length fields.
mkvmerge: bug fix in common AAC code: Fixed wrong calculation of AAC packet size for malformed packets resulting in "safemalloc()" failing to allocate memory. Part of a fix for #832.
mkvmerge: new feature: Implemented support for reading MPLS BluRay playlist files. All M2TS files referenced from an MPLS file are processed. Chapter entries from that MPLS file are used as well. Implements #765.
mmg: bug fix: Selecting one of the pre-defined values from the"split by X" argument drop down box (e.g. "700M") was not leaving the selected entry in the drop down box but set it to empty instead.
mkvmerge: bug fix: Fixed reading VP6 video from FlashVideo files. Fixes #836.
mmg: bug fix: Fixed validating the argument for splitting parts by frame/field numbers. Fixes #835.

New in MKVToolnix 6.0.0 (Jan 21, 2013)

mkvmerge: new feature: Implemented splitting by parts based on frame/field numbers ("--split parts-frames:" in mkvmerge). Implements #819.
mkvmerge: bug fix: Re-writing the track headers after they'd grown a lot (to more than the EBML void size located after them allowed for) led to an integer underflow. Then mkvmerge tried to write a void element the size of that integer (e.g. nearly 4 GB on 32bit platforms). Fixes #822 and #828.
mkvmerge: bug fix in the MP4 reader: Fixed language code conversion from what is used in MP4 to the ISO 639-2 codes used in Matroska (e.g. convert from "deu" to "ger")
Source distribution: source code archives (tarballs) will be compressed with xz instead of bzip2 from now on. The file name's extension will therefore change from ".tar.bz2" to ".tar.xz". The download URL changes accordingly
mkvmerge: new feature: Implemented reading VobSubs from MP4 files if they're stored in the Nero Digital way (track sub-type mp4s', ESDS object type identifier 0xe0). Implements #821 and the second half of #815.
mmg: new feature: Command line options can be saved as default for new jobs by clicking a check box in the "add command line options" dialog.
mmg: bug fix: Fixed a crash in the chapter editor if the root was selected and the user used the "Set values" button.
mkvmerge, mmg: removal: The 'header removal compression' method is not turned on by default anymore. This affects the following track types: AC3, AVC/h.264, Dirac, DTS, MP3. The setting in mmg that turned it off by default has been removed.
mkvmerge: new feature: Added experimental support for the Opus audio codec. Parts of an implementation of #779.
mkvmerge: bug fix: "text"-type tracks in MP4 files are only treated as chapters if their track ID is listed on a "chap" atom inside a "tref" track reference atom. Fixes #815.
mkvmerge, mmg: new feature: Implemented splitting by chapter numbers. Implements #504 and #814.
mkvmerge: enhancement: Removed several warnings from the MPEG-2 video parser code about open GOPs, missing references. Those were too confusing for most users, even after being given additional information via email and FAQs.
mkvextract: new feature: Implemented extraction of ALAC into Core Audio Format files (CAF). Implements #786.
mkvmerge, mmg: new feature: Implemented splitting by frame/field numbers. Implements #771.
mmg: bug fix: Fixed consistency checks when appending files and at least one track is disabled.
mkvmerge: new feature: Implemented a reader for the Flash Video format (.flv). Implements #735.
Build system: Boost's "variant" library is now required.
mkvmerge: bug fix: ISO 639-2 language handling: The deprecated language codes "scr", "scc" and "mol" are replaced by their respective successors "hrv", "srp" and "rum". Fixes #803. mkvmerge: bug fix: Matroska reader: Fixed finding the "segment info" element if it is located behind the clusters.
mkvmerge: bug fix: MP3 parser code: Fixed skipping ID3 tags so that the header directly behind the ID3 tag is recognized properly. Fixes #747.
mkvmerge: bug fix: MP4 reader: Fixed handling of edit lists if the edit list is used to adjust the track's timecodes by a fixed amount (either positive or negative). Fixes #780.
mkvpropedit: bug fix: Giving a non-existent file name in tags mode will result in a proper error message. Fixes #806.

New in MKVToolnix 5.9.0 (Dec 10, 2012)

New in MKVToolnix 5.8.0 (Sep 3, 2012)

New in MKVToolnix 5.7.0 (Jul 10, 2012)

New in MKVToolnix 5.6.0 (May 28, 2012)

documentation: Added Spanish translation of mmg's guide
mkvmerge: bug fix: SRT subtitle entries with colons as the decimal separator are accepted. Fix for issue 754
mkvmerge: bug fix: XML tag files with tags that only contained a name and nested were wrongfully rejected as invalid. Fixes issue 752
mkvmerge: enhancement: mkvmerge was optimizied to keep cluster timecodes strictly increasing in most situations
all: Added a translation to Polish
mkvextract: bug fix: Extraction of AVC/h.264 was completely broken after 2012-04-09 resulting in files with a length of 0 bytes
mmg: new feature: When adding a Matroska file that has either the "previous segment UID" or the "next segment UID" set then mmg will copy those two and the source file's segment UID into the corresponding controls on the "globla" tab if they haven't been set before. Implements ticket 733
mkvmerge: new feature: The verbose identification mode for Matroska files will now includes the "segment UID", the "next segment UID" and "previous segment UID" elements
mkvmerge: enhancement: In "--split parts:" mode mkvmerge will use the output file name as it is instead of adding a running number to it if all the ranges to be kept are to be written into a single output file. Implements ticket 743
mkvextract: bug fix: mkvextract will no longer abort extracing h.264 tracks if it encounters a NAL smaller than its size field. Instead it will warn about it and drop the NAL
mkvmerge: bug fix: Writing more than two parts into the same file with "--split parts:" resulted in the timecodes of the third and all following parts to be wrong. Fixes ticket 740
mkvmerge: bug fix: The "--split parts:" functionality was not taking dropped ranges into account when calculating the segment duration for files that more than one range was written to. Fixes ticket 738
mkvmerge: bug fix: The "--split parts:" functionality was producing a small gap between the first part's last packet's timecode and the second part's first packet's timecode if two parts are written to the same file. Fixes ticket 742
mkvmerge: bug fix: The "--split parts:" functionality was writing a superfluous and empty first part if the first range starts at 00:00:00. Fixes ticket 737
mmg, build system: Fixed building with wxWidgets 2.9.3

New in MKVToolnix 5.5.0 (Apr 7, 2012)

Build system: Boost's "lexical_cast" and "type traits" libraries are now required.
mmg: new feature: Added GUI controls for mkvmerge's "file concatenation" feature as "additional file parts". The user can choose which individual files are treated as if they were a single huge source file.
mkvmerge: bug fix: The handling of the "do not read other files" options (e.g. "=file.vob" and "( file.vob )") was broken for MPEG program stream files.
mkvmerge: bug fix: Fixed a wrong assertion about minimum MPEG 1/2 video start code lengths. Fixes ticket 728.
mkvmerge, mmg: new feature: Added support for keeping only certain timecode ranges from the source files with a new format to "--split": "--split parts:...". Implements ticket #518.
mmg: new feature: Added an option in the preferences dialog called "clear jobs from the job queue after they've been run". Can be set to "only if run was successfull", "even if there were warnings" and "even if there were errors". Defaults to off.
mkvmerge, mkvextract, mmg: Re-write of the whole XML handling code. It now uses the "pugixml" C++ library instead of the "expat" library. Therefore "expat" is not required for building MKVToolNix anymore. And neither is Boost's "property tree" library. "pugixml" itself is included and not an external requirement either.
Build system: removed all files and documentation related to building MKVToolNix with Microsoft's Visual Studio because even the most recent version of Visual C++ does not support the C++11 features required for MKVToolNix.
mkvmerge, mkvextract: removal: Removed support for the CorePicture file format. It was mostly unused and relied on old code that will be removed soon.
documentation: enhancement: mkvmerge's man page has been updated with a list of valid XML tags for the chapters, tags and segment info XML file formats.
all: Updated the DTD files with the newly supported elements.
mkvmerge: enhancement: Chapter XML files: mkvmerge can handle the "ChapterSegmentEditionUID" element.
mkvmerge: enhancement: Segment info XML files: mkvmerge can handle the "SegmentFilename", "PreviousSegmentFilename" and "NextSegmentFilename" elements.
mmg: enhancement: Added "mts" as yet another file extension for MPEG transport streams.
mmg: bug fix: Fixed a crash due to a missing argument for a format string when clicking on the "Browse" button for the track-specific tags.
mmg, mkvinfo's GUI, all .exes: enhancement: Added new icons
mkvextract: bug fix: mkvextract sometimes wrote undefined values to a single reserved header field when extracting into AVI files.
mkvmerge: bug fix: AVC/h.264 mkvmerge was wrongfully writing a default duration of 60 frames/fields even if the source was signalling 60000/1001 frames/fields. The frame timecodes have been correct already.
mkvmerge: bug fix: Fixed timecode calculation for (E)AC3 tracks if the source container (e.g. MPEG transport streams) only provided timecodes for some of the (E)AC3 packets itself.

New in MKVToolnix 5.4.0 (Mar 12, 2012)

mkvmerge: bug fix: Fixed wrong calculation of the maximum number of ns per cluster in certain fringe cases if timecode scale was nset to "auto" mode ("--timecode-scale -1"). Fix for bug 707. build system: The C++ compiler must now support the C++11
keyword 'nullptr'. configure checks for it. For GCC this means at least v4.6.0.
mkvinfo: new feature: mkvinfo will output the track ID that mkvmerge and mkvextract would use for a track. This information is shown alongside the "track number" element in verbose mode and in the track summary in summary mode.
mkvmerge, mmg: enhancement: The "--default-duration" in mkvmerge and the "FPS" drop down box in mmg now accept "p" or "i" as a unit as in e.g. "25p" or "50i". Several commonly used values have been added to mmg's "FPS" drop down box and others removed.
mkvmerge: bug fix: When using an external timecode file with AVC/h.264 video the default duration will be set to the most-often used duration in the timecode file.
mmg: enhancement: Added the values "50", "60" and "48000/1001" to the list of commonly used values for the "FPS" input field.
mkvmerge: bug fix: AVC/h.264 packetizer: The value given with "--default-duration" (after internal conversion from the unit given by the user to duration in nanoseconds) is now again interpreted as the duration of a frame and not of a field.
mkvmerge: bug fix: SRT subtitles: timecodes can contain the minus sign before any digit, not just before the first one.
mkvmerge: bug fix: Sometimes non-AC3 files were mistakenly for AC3 after the re-write of the AC3 handling code on 2012-02-26. This has been rectified. Fix for bug 723.
mkvmerge: enhancement: mkvmerge will keep the "enabled" track header flag when muxing. mkvmerge will also output its value in verbose identification mode as "enabled_track".
mkvmerge: enhancement: MicroDVD text subtitles are recognized as an unsupported format instead of an unknown format.
mmg: The warning that no default duration/FPS has been given for AVC/h.264 tracks has been removed.
mkvmerge: bug fix: Complete re-write of the timecode handling code for AVC/h.264 tracks. Now handles several cases correctly: interlaced video, video with multiple or changing SPS with different timing information. The timing information is extracted from the bitstream. Therefore the user doesn't have to specify the default duration/FPS himself anymore. Fix for bugs 434 and 688.
build system: Boost's "rational" library is now required.
mkvmerge: bug fix: Complete re-write of the (E)AC3 parsing and handling code. Dependent EAC3 frames are now handled correctly. Fix for bug 704.
mkvmerge: bug fix: The width and height of h.264 video tracks with a pixel format other than 4:2:0 are now calculated correctly. Fix for bug 649.
mkvmerge: bug fix: Fixed file type recognition and frame drops for VC1 elementary streams that do not start with a sequence header but with frame or field packets instead.
mkvmerge: bug fix: Fixed mis-detection as unsupported DV files happened for e.g. PGS subtitle files).
doc: enhancement: Updates for option file usage and supported subtitle formats.

New in MKVToolnix 5.3.0 (Feb 10, 2012)

mkvmerge: new feature: mkvmerge will parse and apply the audio encoder delay in MP4 files that contain said information in the format that iTunes writes it. Fix for bug 715.
mkvmerge: new feature: Implemented support for treating several input files as if they they had been concatenated binarily into a single big input file. Snytax is "mkvmerge -o out.mkv ( in1.ts in2.ts in3.ts )". This feature has already been present since version 5.1.0 but never been mentioned in the ChangeLog. Support for this feature in mmg is still missing.
mkvmerge: bug fix: Blocks with "BlockAdditions" will no longer be muxed as "SimpleBlock" elements discarding the additions but instead as "BlockGroup" elements. This applies to e.g. WAVPACK4 tracks with correction files as the correction data is stored in "BlockAdditions". Fix for bug 713.
mkvmerge: bug fix: Fixed some more issues with (E)AC3 being misdtected as AVC elementary streams.
mmg: bug fix: The header editor was sometimes creating two instances of an element if an element was added to the second or one of the later tracks. Fix for bug 711.
mkvpropedit, mmg: bug fix: Trying to modify a file located in a path mounted with GVFS SFTP will no longer crash the programs. Instead an error message is output if an error occurs. Fix for bug 710.
mkvmerge: bug fix: Fixed integer underflows in the read caching code resulting in invalid memory access. Happened in broken or incomplete files only. Fix for bug 709.
mkvmerge: bug fix: Appending AVI, Matroska or MPEG program stream files with DTS audio tracks will not result in a warning that the appended DTS tracks might not be compatible. Fix for bug 705.
mkvextract: bug fix for the "timecodes_v2" mode: mkvextract will write one more timecode than there are frames in the file. The last timecode written will be the the sum of the last frame's timecode and duration with the "last frame" being the one with the highest timecode. Fix for bug 691.
mkvmerge: bug fix: Fixed writing into paths on which a drive is mounted on Windows. Fix for bug 701.
mkvmerge: enhancement: Identification output for Matroska files: Added the track number header field as "number" to the verbose identification mode.
mkvmerge: enhancement: Identification output for Matroska files: Added a field "content_encoding_algorithms" that contains a comma-separated list of encoding algorithm IDs used for that track. For example, "content_encoding_algorithms:3" would indicate that header removal compression is used.
mkvmerge: enhancement: Identification output for Matroska files: Added several fields to mkvmerge's verbose identification mode for tracks: UID, CodecID, length and content (as a hex dump) of the codec private data.
mkvmerge: bug fix: Fixed a segmentation fault in the DTS detection code. Fix for bug 698.
mkvextract: bug fix: The track IDs used in the "timecodes_v2" extraction mode are consistent again with the IDs that mkvmerge's identification reports and that mkvextract's "tracks" extraction mode uses. Fix for bugs 689 and 694.
mkvmerge: enhancement: Added video pixel dimensions to the output of "--identify-verbose" for Matroska files.

New in MKVToolnix 5.2.1 (Feb 10, 2012)

New in MKVToolnix 5.2.0 (Dec 19, 2011)

New in MKVToolnix 5.1.0 (Dec 19, 2011)

mkvmerge: bug fix: Fixed more timecode handling issues for video tracks in MPEG transport streams whose PES packets sometimes don't have a timecode.
mkvmerge: bug fix: mkvmerge will no longer create folders on drives it shouldn't create them on on Windows.
mkvmerge: bug fix: Fixed bogus huge timecodes sometimes occurring for AVC/h.264 video tracks read from MPEG transport streams.
all: enhancement: Made all EXEs declare their required access level privileges for Windows' User Access Control.
mmg: enhancement: Made mmg DPI-aware on Windows (tested up to 144 DPI).
mmg: bug fix: mmg will append ".xml" to the file name entered when saving from the chapter editor if no extension was given.
mkvinfo: bug fix: Improved skipping broken data on all operating systems.
mkvmerge, mkvextract: bug fix: Skipping broken data in Matroska file often caused the program to abort on Windows. This has been fixed so that processing continues after the broken part. Fix for bug 668.
examples: Added XSLT 2.0 stylesheets in the "examples/stylesheets" directory for turning Matroska chapters into cue sheet and split points for "shntool" (useful for situations in which you have e.g. a live recording from a concert including chapters and want to create one audio file per song).
mkvmerge: bug fix: Fixed reading VC1 video tracks from Matroska files that don't use VC1 start markers (0x00 0x00 0x01 ...).
mmg: enhancement: Added "ogv" to the list of known file extensions for "Ogg/OGM audio/video files". Implements bug 667.
mmg: bug fix: A utility function for breaking a line into multiple ones was accessing invalid memory in rare situations causing mmg to crash. Could happen e.g. when adding a job to the job queue.
mkvmerge: bug fix: mkvmerge will use DTS instead of PTS for VC1 video tracks read from MPEG transport streams.
build system: Boost's "Range" library is now required.
build system: Boost v1.46.0 or newer is now required. As a consequence included copies of some of Boost's libraries have been removed (foreach, property tree).
build system: The C++ compiler must now support several features of the C++11 standard: initializer lists, range-based 'for' loops, right angle brackets, the 'auto' keyword and lambda functions. configure checks for each of these. For GCC this means at least v4.6.0.
mkvmerge: bug fix: Fixed reading MPEG transport streams on big endian systems.
mkvmerge: enhancement: Added support for reading AAC tracks from MPEG transport streams.
mkvmerge: bug fix: Relaxed the compatibility checks when concatenating VP8 video tracks.
mkvmerge: bug fix: Fixed PCM audio in WAV sometimes being detected as DTS.
mkvmerge: enhancement: The verbose identification mode will add the properties "default_duration", "audio_sampling_frequency" and "audio_channels" if appropriate and if the corresponding header elements are present.
mkvmerge: enhancement: "Castilan" has been merged with "Spanish" into "Spanish; Castillan" in the ISO 639 language list as both share the same ISO 639-2 code "spa".

New in MKVToolnix 5.0.1 (Nov 11, 2011)

New in MKVToolnix 5.0.0 (Nov 11, 2011)

2011-09-24 Moritz Bunkus
Released v5.0.0.
build system: libEBML 1.2.2 and libMatroska 1.3.0 are required for building. If external versions are not found or if they’re too old then the included versions will be used as a fallback.
2011-09-21 Moritz Bunkus
mkvmerge: bug fix: The "writing application" element will not be localized but always be written in English.
2011-09-20 Moritz Bunkus
mkvmerge: new feature: MPEG TS: mkvmerge will extract the track languages from a corresponding clpi (clip info) file. That file is searched for in the same directory and in ../CLIPINF and must have the same base name but with the ".clpi" extension.
mkvmerge: enhancement: Added new stereo mode options to match the current specs. The new options are "anaglyph_green_magenta" (12), "both_eyes_laced_left_first" (13) and "both_eyes_laced_right_first" (14).
mkvmerge: The –stereo-mode named option "anaglyph" was renamed to "anaglyph_cyan_red" to match the specs. The numerical value (10) remains unchanged.
2011-09-18 Moritz Bunkus
mkvextract: bug fix: Fixed attachment number displayed during extraction. Fix for bug 663.
mkvmerge: enhancement: MPEG TS: Added support for HDMV PGS subtitles.
mkvmerge: enhancement: MPEG TS: Added support for DTS HD Master Audio tracks.
2011-09-17 Moritz Bunkus
mkvmerge: enhancement: MPEG TS: Streams that are mentioned in the PMT but do not actually contain data are neither reported during identification nor muxed.
2011-09-14 Moritz Bunkus
mkvmerge: new feature: MPEG TS: Added support for reading the language code.
2011-09-13 Moritz Bunkus
mmg: enhancement: Added MPEG transport streams to the "add file" dialog file selector.
mkvmerge: new feature: MPEG TS: Added support for normal DTS tracks.
mkvmerge: Tons of fixes and additions to the MPEG transport stream demuxer.
2011-09-10 Moritz Bunkus
build system: configure will accept external versions of libEBML and libMatroska again. Minimum required versions are libEBML 1.2.1 and libMatroska 1.1.0.
2011-09-07 DenB
All: Updated the French translation with a complete set by DenB (see AUTHORS).
2011-09-05 Cosme Domínguez
mmg: mmg respects the XDG Base Directory Specification regarding its configuration files (environment variable $XDG_CONFIG_HOME/mkvtoolnix if set, otherwise ~/.config/mkvtoolnix).
2011-08-24 Moritz Bunkus
all: Added an Lithuanian translation by Mindaugas Baranauskas (see AUTHORS).
2011-08-14 Massimo Callegari
mkvmerge: new feature: Implemented a MPEG transport stream demuxer.
2011-08-02 Moritz Bunkus
mkvmerge: enhancement: When looking for MPEG files with the same base name as a source file mkvmerge will be stricter what it accepts. The file name must consist of at least one char followed by "-" or "_" followed by a number. That will match VTS_01_1.VOB but not e.g. "some_series_s03e10.mpg".
2011-07-31 Moritz Bunkus
mkvmerge: bug fix: Opening MPEG files with numbers in their name from folders with e.g. Cyrillic names failed on Windows.
mkvmerge: bug fix: Several elements are not written when creating WebM compliant files. In the segment headers: SegmentUID, SegmentFamily, ChapterTranslate, PreviousSegmentUID, NextSegmentUID. In the track headers: MinCache, MaxCache and MaxBlockAdditionID.
2011-07-19 Moritz Bunkus
mkvmerge: enhancement: Sped up file identification by caching read operations.
mkvmerge: bug fix: Fixed identifying QuickTime/MP4 files that start with a ‘skip’ atom.
2011-07-13 Moritz Bunkus
mkvmerge: bug fix: Fixed a crash when reading AVI files with DTS audio tracks that do not contain valid headers in the first couple of packets. Fix for bug 646.

New in MKVToolnix 4.9.1 (Jul 12, 2011)

New in MKVToolnix 4.9.0 (Jul 11, 2011)

New in MKVToolnix 4.8.0 (May 24, 2011)

New in MKVToolnix 4.7.0 (Apr 22, 2011)

New in MKVToolnix 4.6.0 (Mar 10, 2011)

New in MKVToolnix 4.5.0 (Feb 1, 2011)

build: Building mkvtoolnix now requires libebml v1.2.0 and libmatroska v1.1.0 or later.
build: enhancement: mkvtoolnix now includes libebml and libmatroska. The configure script will use them if either no installed versions of them is found or if the installed version is too old.
mkvmerge: bug fix: Fixed an infinite loop when reading program stream maps in MPEG program streams. Part of a fix for bug 589.
mkvinfo: new feature: Added an option "--track-info" (short: "-t") that displays one-line statistics about each track at the end of the output. The statistics include the track's total size, duration, approximate bitrate and number of packets/frames.
mkvinfo: bug fix: The hexdump mode was accessing invalid memory if the data to dump was shorter than 16 bytes. It was also outputting the values as characters instead of hexadecimal numbers. Fix for bug 591.
mmg: enhancement: The output file name extension is automatically set to ".mk3d" if the stereo mode parameter for any video track is changed to anything else than "mono" or the default value.
mmg: enhancement: Added ".mk3d" to the list of known file name extensions for Matroska files.
mkvmerge, mmg: enhancement: Updated the "stereo mode" parameter to match the current Matroska specifications.
mkvmerge: enhancement: If mkvmerge encounters invalid UTF-8 strings in certain files or command line arguments then those strings will simply be cut short. Before mkvmerge was exiting with an error ("Invalid UTF-8 sequence encountered").
all: new feature: Added online update checks. The command line tools know a new parameter "--check-for-updates". mmg has a new menu entry ("Help" -> "Check for updates") and checks automatically when it starts, but at most once in 24 hours. Can be turned off in the preferences. This function requires libcurl and is not built if libcurl is not available.
mkvmerge: bug fix: Avoid a crash due to invalid memory access if a source file name contains numbers (happens only if mkvtoolnix is built with MS Visual Studio). Fix for bug 585.
mkvmerge: new feature: Added support for reading VP8 video from Ogg files. Implements bug 584.
mkvextract: enhancement: mkvextract will exit with an error if the user specifies track IDs that do not exist in the source file. This works in the "tracks" and "timecodes_v2" extraction modes. Fix for bug 583.
docs: mkvextract's man page has been updated to match the program's expected command line syntax for the "timecodes_v2" mode. Fix for bug 583.
build system: Fixed building the Qt version of mkvinfo's GUI. Fix for bug 576.
mkvmerge, mmg: bug fix: Option files could not contain options that started with '#' as they were interpreted as comment lines.
mkvmerge: new feature: The "default duration" header field is set for DTS audio tracks.
build system: mmg's guide and its images are installed into the location given by configure's "docdir" variable.
all: Made the French translation selectable in all programs.

New in MKVToolnix 4.4.0 (Nov 2, 2010)

New in MKVToolnix 4.3.0 (Sep 6, 2010)

New in MKVToolnix 4.2.0 (Jul 29, 2010)

mkvmerge: bug fix: mkvmerge was accessing invalid memory In certain cases, e.g. when appending Matroska files that use compression while turning compression off.
mkvmerge: bug fix: Splitting output files by size was basing its decision when to create a new file on an uninitialized variable. This caused effects like a lot of small files being created with sizes much smaller than the intended split size.
mkvmerge: bug fix: The speed with which mkvmerge skips garbage
in DTS tracks has been greatly improved.
mkvmerge: enhancement: Reading Matroska files: DisplayWidth & DisplayHeight values that are obviously not meant to represent pixels but only to be used for aspect ratio calculation (e.g. 16x9) are converted into proper ranges based on the track's PixelWidth & PixelHeight values and the quotient of DisplayWidth /DisplayHeight.
mkvmerge: enhancement: Attachments will be rendered at the end
of the file instead of at the beginning. The attachments will be placed after the cues but before the chapters. Fix for bug 516.
mkvmerge: enhancement: Header removal compression has been enabled by default for MPEG-4 part 10 (AVC/h.264) video tracks
with a NALU size field length of four bytes.
mkvmerge: bug fix: Header removal compression has been deactivated for MPEG-4 part 2 (aka DivX/Xvid) video tracks due to incompatibility with packed bitstreams.
mmg: enhancement: The taskbar progress is reset as soon as
mkvmerge finishes/as soon as all jobs are done (Windows 7).
mkvmerge: bug fix: Fixed reading AVC/h.264 tracks from AVI files if they're stored without NALUs inside the AVI. Was broken by a
fix for handling AVC/h.264 in NALUs inside AVI.
mkvmerge: bug fix: All readers that only handled file formats which do not contain more than one track did not respect the "--no-audio / --no-video / --no-subtitles" options. This applied to the following readers: AAC, AC3, AVC/h.264, CorePicture, Dirac, DTS, FLAC, IVF, MP3, MPEG ES, PGS/SUP, SRT, SSA, TrueHD, TTA, VC1, WAV and WavPack.
mkvmerge: enhancement: Improved reading text files that use
mixed end-of-line styles (DOS & Unix mixed).
mkvmerge: bug fix: Fixed invalid memory access in the PCM
packetizer. Fix for bug 510.
mmg: bug fix: When mmg starts it will check the entries in the file and chapter menu's list of recently used files and remove those entries that no longer exist. Fix for bug 509.
mkvmerge: bug fix: Fixed a crash when reading Matroska files that were damaged in a certain way.