![]() ![]() Upon creation of the file, the codec translates between raw data and the (compressed) data format used inside the chunk. The third optional sub-chunk is identified by the "idx1" tag which indexes the offsets of the data chunks within the file.īy way of the RIFF format, the audio-visual data contained in the "movi" chunk can be encoded or decoded by software called a codec, which is an abbreviation for (en)coder/decoder. This chunk contains the actual audio/visual data that make up the AVI movie. The second sub-chunk is identified by the "movi" tag. This sub-chunk is the file header and contains metadata about the video, such as its width, height and frame rate. The first sub-chunk is identified by the "hdrl" tag. ![]() An AVI file takes the form of a single chunk in a RIFF formatted file, which is then subdivided into two mandatory "chunks" and one optional "chunk". AVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or "chunks." Each "chunk" is identified by a FourCC tag.
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