The AACGain application was designed to be a modification to Glen Sawyer's excellent MP3Gain program. It supports AAC (mp4/m4a/QuickTime) audio files in addtion to mp3 files.
AACGain normalizes the volume of digital music files using the Replay Gain algorithm. It works by modifying the global_gain fields in the mp4 samples. Free-form metadata tags are added to the file to save undo information, making the normalization process reversable.
AACGain uses the same command-line user interface as mp3gain, and is compatible with the mp3gain Visual Basic GUI.
What's New in This Release: [ read full changelog ]
· Built with mpeg4ip/mp4v2 version 1.6.1. Aacgain 1.7.1 was built with
· version 1.5.20. Mp4v2 version 1.6.1 corrects problems that corrupted
· video files containing Quicktime chapter markers.
· Built with latest mp3gain version 1.4.7 sources checked into CVS.
· The mp3gain changes made since 1.7.1 support sample rates up to 96000.
· Previous versions had a maxmimum sample rate of 48000.
· Ignores faad2 "scalefactor out of range" errors. These errors resulted
· in "invalid file format" errors on apparently good files.
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