Motion JPEG

According to the Library of Congress, Motion JPEG (M-JPEG) is a legacy format worth saving, because so many still images are stored in the JPEG compression format, and M-JPEG is essentially a restricted JPEG with a fixed YCbCr colorspace, encoded at 4:2:2, and using basic Huffman encoding, rather than arithmetic or progressive encoding. M-JPEG encodes video one frame at a time, and applies standards JPEG compression to each independent frame. It is considered an intraframe compression, offering only spatial compression. As such, it offers no additional multi-frame compression, also know as temporal or interframe compression. M-JPEG continues to be used as an I-frame only capture, despite more than a decade of the more popular H.264 interframe compression, primarily in lower-end still image cameras that already capture in JPEG and can therefore apply a format wrapper around a series of JPEG stills to present a multi-image moving image file.