In addition, each track contains a digitally-encoded media stream (using a specific format) or a data reference to the media stream located in another file. The format specifies a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, or text (e.g., for subtitles). 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". Because both the QuickTime and MP4 container formats can use the same MPEG-4 formats, they are mostly interchangeable in a QuickTime-only environment.ĪVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or "chunks." A FourCC tag identifies each "chunk".
The International Organization for Standardization approved the QuickTime file format as the basis of the MPEG-4 file format. QuickTime File Format (QTFF) is a computer file format used natively by the QuickTime framework. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback.
Video/vnd.avi, video/avi, video/msvideo, video/x-msvideoĪudio Video Interleaved (also Audio Video Interleave), known by its initials AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software.
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