Motion JPEG

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Motion JPEG (a.k.a. MJPEG) is a sub-category of motion video codecs where successive frames are encoded using the standard JPEG algorithm. No interframe compression is performed and the resulting encoded data generally does not achieve the same level of compression as a codec using interframe techniques. However, decompression is usually faster and any frame can be referenced independently since there are no dependencies on other frames. Plus, there are fewer legal caveats when using the open JPEG standard.

Note that 'MJPEG' does not describe a single format. Many entities have created formats that can be described as MJPEG, though they have subtle differences from each other.

  • QuickTime files can store 2 variations of MJPEG: types A and B, denoted with the FourCCs 'mjpa' and 'mjpb' respectively.
  • Nintendo GameCube games often use a format called THP which stores video as JPEG frames but without escape codes.