Audio Video Interleave

Audio Video Interleave, known by its acronym AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a standard container that allows synchronous audio-with-video playback. Like DVDs, AVI files support multiple streaming audio and video, although these features are seldom used. Most AVI files also use the file format extensions developed by the Matrox OpenDML group in February 1996. These files are supported by Microsoft, and are unofficially called "AVI 2.0".
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<multimedia> (AVI) An audio-video standard designed by Microsoft. Apparently proprietary and Microsoft Windows-specific.
http://www2.echo.lu/oii/en/video.html#AVI.
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(1996-09-08)