The GIF file format is a type of bitmap image and has become popular due to the growth of the internet.
What programs can I use to open an AVI file ?. The third optional sub-chunk is identified by the idx1 tag which indexes the offsets of the data chunks within the file. 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. Each chunk is identified by a FourCC tag. Its advatage is a simple architecture, due to which AVI runs on a number of different systems like Windows, Mac, Linux, Unix and is supported by all of the most popular web-browsers.'ĪVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or chunks. 
AVI combines audio and video into a single file in a standard container to allow simultaneous playback. Developed by Microsoft in 1992, it has become so widespread that many people consider it the de-facto standard for storing video and audio information on PC.
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