motion-JPEG [M-JPEG]


(pronounced “em-JAY-peg”) (n.) Motion–Joint Photographic Expert Group; a proprietary extension of the JPEG compression standard for still images that adapts it for moving images. Used to compress a stream of moving pictures at a constant frame rate, M-JPEG provides much lower compression ratios than do video compression standards, such as MPEG, which capitalize on similarities between successive frames. M-JPEG files are editable but generally are not transportable to different hardware platforms for playback. M-JPEG is implemented differently depending on the hardware used to encode it, but QuickTime version 3.0 translates M-JPEG from most proprietary formats and may be used to decode common M-JPEG files.

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