MJPEG

JPEG stands for the Joint Photographic Experts Group standard, a standard for storing and compressing digital images.

Motion-JPEG extends this standard by supporting videos. Unlike MPEG, MJPEG compresses and stores every frame rather than only the differences between one frame and the next. Thus it requires more space than MPEG, but it is more efficient when rapid scene changes are involved, and easier to edit.

Depending on the codec used, an MJPEG one hour video clip may take up as much as 20 GBs of hard drive space. If you use the PicVideo MJPEG V2 codec at 95%, a one hour clip will take up about 3.5 GBs of hard drive space.