AVI (Audio Video Interleave)

AVI stands for Audio Video Interleave, a multimedia file format introduced by Microsoft in November 1992 to compete with Apple's QuickTime technology. It is now mostly referred to as a container format.

Despite being an older technology, AVI is still widely used due to the ubiquity of Windows and its easy-to-use development API.

The structure of an AVI file is divided into three parts: "header", "body", and "index". The body contains both video and audio data stored interactively, allowing easy indexing for playback.

AVI combines video and audio into a single file, with the sequence being several video frames followed by several audio frames, and so on. This interleaving ensures audio remains synchronized with video during playback. Similar to DVD video formats, AVI files support multiple video and audio streams, though these features are rarely used. Most AVI files also support the format extension developed by the Matrox OpenDML group in February 1996, informally known as "AVI 2.0", which is supported by Microsoft.

AVI itself provides a framework for video and audio data, with the actual data being encoded in any format. However, due to the index being placed at the end of the file, AVI struggles with streaming media over the internet.


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