.AVI File Extension

Audio Video Interleave File

Video File
Audio Video Interleaved (.AVI) is a multimedia container format developed by Microsoft as a part of Video for Windows technology. AVI files can contain both audio and video data in a file container and that allows synchronous audio-with-video playback.

AVI is a variant of the Resource Interchange File Format (RIFF), which divides file's data into blocks, or “chunks”.

The first sub-chunk is identified by the “hdrl” tag and is the file header which contains metadata about the video such as width, height and frame rate.

The second sub-chunk is identified by the “movi” tag. It contains the actual audio/video data of the AVI movie.

The third (optional) sub-chunk is identified by the “idx1” tag and indexes the offsets of the chunks within the file.

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Comments (1)
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2010-04-27 11:57:35
The .avi simply shows the container.

A container file includes both a video stream and an audio stream. You will need a 'codec' (coder/decoder) for the video stream AND the audio stream.

And when you have the codecs which work for one .avi file, they may not (probably won't) work for another .avi file.