See also: Video Formats | Moving Picture Experts Group
Wikipedia: MPEG-2 (http://www.wikipedia.org/wiki/MPEG-2)
A set of audio and video compression techniques developed by the Moving Picture Experts Group. MPEG-2 provides good video compression by sending relatively few frames of video with an entire image, then sending all other frames with only the variation from the full frames. MPEG-2 is the standard for DVD video.
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