.MJPEG File Extension
What is an MJPEG file?
Video file compressed using the Motion JPEG (M-JPEG or MJPEG) format commonly created by digital cameras, webcams, and other mobile devices; consists of a sequence of .JPEG images.
The M-JPEG format is easily editable, but takes up a sizable amount of disk space. The format is used by media players, web browsers, digital cameras, consoles, video cameras, and streaming servers.
NOTE: The .MJPG extension is more common than the MJPEG extension.