MPEG4 files stores digital video data. MPEG4 can combine audio and video streams into single file.

MPEG4 files use MPEG-4 audio and video encoding set of standards. MPEG4 files are typically used for streaming or distributing video data. MPEG4 extension is rarely used and gives precedence to more popular MP4 extension. MPEG4 files are supported by most media players on the market.