Audio Video Interleave
Audio Video Interleave, known by its initials AVI and the .avi filename extension, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. Like the DVD video format, AVI files support multiple streaming audio and video, although these features are seldom used.Read more on Wikipedia
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