AVI does not provide a standardized way to encode aspect ratio information, with the result that players cannot select the right aspect ratio automatically (though it may be possible to do so manually).

Since its introduction in the early 90s, new computer video techniques have been introduced which the original AVI specification did not anticipate. Some of the limitations of AVI in modern use relate to a lack of standardization in this metadata (see Limitations below). As such, it is theoretically possible to expand any RIFF file format, including AVI, to support almost any conceivable metadata.

By design, any RIFF file can legally include additional chunks of data, each identified by a four-character code software which does not understand that particular code should skip the chunk. In addition, AVI files can embed Extensible Metadata Platform (XMP). MetadataĪs a derivative of the Resource Interchange File Format (RIFF), AVI files are commonly tagged with metadata in the INFO chunk. An AVI file may carry audio/visual data inside the chunks in virtually any compression scheme, including Full Frame (Uncompressed), Intel Real Time (Indeo), Cinepak, Motion JPEG, Editable MPEG, VDOWave, ClearVideo / RealVideo, QPEG, and MPEG-4 Video. 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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