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MP4 (or MPEG-4) is a multimedia container format, mainly used to store digital video and audio streams and to share video files over the Internet.
This format uses separate compression for its video and audio tracks, so that video features MPEG-4 video encoding, while audio is based on AAC compression.
MP4 files can be played on numerous software applications and several portable devices, such as the Microsoft Zune portable media player.
Experienced users will be able to use MP4-compatible applications to adjust the bit rate or the aspect ratio of their source files.