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AVI, Audio Video Interleave (.avi)


The .avi file format

AVI is an abbreviation for Audio Video Interleave. AVI files have an .avi extension. It was developed by Microsoft in 1992and it has become widespread as it is considered by many people the de-facto standard for video and audio information storage on the PC. AVI combines Video and Audio into a single file in a standard container to allow simultaneous playback. AVI runs on numerous systems like Windows, Unix, Mac, Linux and it is also supported by most of popular web browsers


.avi technical details

AVI was derived from the Resource Interchange File Format that divides a file’s data into chunks or blocks. Each block is identified by a fourCC tag. An AVI file takes the form of a single block in a Resource Interchange File Format (RIFF). This is then subdivided into two mandatory blocks and one optional block. The first sub-block is identified by the hdrl tag. This sub-block is the file header that contains metadata about the video, such as its height, width and frame rate. The second sub-block is identified by the movi tag. this block contains the actual audio-visual data which makes up the AVI movie. The third optional sub-block is identified by the idx1 tag that indexex the offsets of data blocks within a file.


Additional information about AVI file format

File extension .AVI
File category VIDEO
Useful links http://pcsupport.about.com/od/fileextensions/f/avifile.htm
File conversion Convert a file to AVI
Developer Microsoft
Associated programs Apple Quick Time Player Video LAN VLC Media Player All Player Microsoft Windows Media Player