What’s AVI, AVI video file format description
AVI combines audio and video into a single file in a standard container to allow simultaneous playback. It’s advantage is it’s simple architecture, due to which AVI runs on a number of different systems like Windows, Mac’s, Linux, Unix and is supported by all most popular web-browsers.
AVI format is one of the oldest video formtas. Since the day of it was developerd there have appeared a lot of AVI codec’s created by both vendors and individuals. So now there are hundreds of avi files that look similar but are completely different inside. That may cause trouble when converting avi files to other formats.
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. 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”. The entire structure of a RIFF file was copied from an earlier IFF format devised by Electronic Arts in the mid-1980s[citation needed], the primary difference being the “endianness” of integers. In fact, even a properly written IFF parser for the now old-aged AmigaOS, (after correcting for endianness) will parse RIFF files.AVI (Audio Video Interleaved) file is a sound and motion picture file that conforms to the Microsoft Windows Resource Interchange File Format (RIFF) specification. AVI Video content that is compressed with a wide variety of codecs can be stored in an .avi file and played in Windows Media Player, if the appropriate codecs are installed on the computer.
By 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. Upon creation of the file, the codec translates between raw data and the (compressed) data format used inside the 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.
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