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AVI:
As defined by Microsoft, AVI stands for Audio Video Interleave.
AVI files are basically a number of still images called frames that
are combined sequentially in one file. When the file is played,
the player, Media Player for example, chugs through the AVI file
and displays each consecutive image in the same way that movie film
rolling through a projector displays a movie.
AVI
files may contain thousands of frames, and all of that picture information
can produce very large file sizes. To reduce the file size, the
video data is compressed using various compression algorithms. When
implemented, these compression algorithms are called codecs. Codec
stands for Compressor/ Decompressor. While it is possible to create
an uncompressed AVI, the file size is enormous. Type 1 AVI files
are limited to a 2GB file size, and an uncompressed AVI file may
realize that size limit in 2 minutes. Therefore almost all AVI files
are compressed.
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