Overview: ISO base media and QuickTime
ISO base media and QuickTime formats use related structural ideas to organize timed media and its supporting metadata.
MP4 and MOV files expose relationships among track descriptions, timing and stored media through structured container elements. Their shared history does not make every file interchangeable. The pages here distinguish the applicable format definitions and the media information a reader needs before judging a particular file's compatibility.
MP4 and the ISO base media file format
MP4 is a container derived from the ISO base media file format that stores encoded media with track descriptions and timing.QuickTime (MOV)
QuickTime MOV stores timed media and presentation information in an atom-based container that predates the ISO base media file format.