FourCC, a four character code in beginning of media file, mostly associated withAVI, that tells whatcodec your system should use fordecoding the file.
Method was implemented originally byElectronic Arts back in 80s forAmiga'sIFF file format which was an universal multimedia file format that supported audio, video and pictures within same wrapper format. Later this was copied toApple'sAIFF format andMicrosoft'sRIFF format.
For an excellent list of recognized FourCC codes, please visitthis website.
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