It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files. 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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