MPEG-4 is the method for defining compression for digital audio-visual digital data.
Introduced in 1998 by The Moving Picture Experts Group it is commonly used for sharing video files over the Internet.
MPEG-4 absorbs many of the features of MPEG-1 and MPEG-2 formats, adding some new features such as VRML (Virtual Reality Modeling Language) support for 3D rendering, object-oriented composite files and various types of interactivity. MPEG-4 format uses separate compression methods for the audio and video tracks. Video is compressed with MPEG-4 video encoding, and the audio is using the AAC compression. MP4 is quite popular among the users of iPod, iPhone and PSP.
Ratified as part of the MPEG-4 standard (MPEG-4 Part 10), H.264 delivers stunning quality at remarkably low data rates.
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