AVI format is one of the oldest video format. Because the day of it had been developerd there have appeared lots of AVI codec's produced by both vendors and individuals. So now there are countless avi files that seem to be similar but they are very different inside. That will cause trouble when converting avi files to formats.
AVI can be a derivative with the Resource Interchange Extendable (RIFF), which divides a file's data into blocks, or "chunks." Each "chunk" is identified with a FourCC tag. An AVI file takes the form of just one chunk in a very RIFF formatted file, which can be then subdivided into two mandatory "chunks" and one optional "chunk". The entire structure of your RIFF file was copied from an early on IFF format devised by Electronic Arts in the mid-1980s[citation needed], the main difference being the "endianness" of integers. In point of fact, a properly written IFF parser to the now old-aged AmigaOS, (after correcting for endianness) will parse RIFF files.
AVI (Audio Video Interleaved) file is usually a sound and movie file that conforms to the Microsoft Windows Resource Interchange Extendable (RIFF) specification. AVI Video content that is compressed which has a wide array of codecs is usually held in an .avi file and took part in Windows Media Player, if the appropriate codecs were installed on your computer.
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