: In fragmented MP4s, the file is broken into "moof" (movie fragment) and "mdat" (media data) boxes to allow for immediate playback.
: Separate streams for video (often H.264/AVC) and audio (often AAC). g60112.mp4
: If you need to handle the file programmatically, you can use FFmpeg to create a "fragmented MP4." This splits the video into independently decodable segments, which is ideal for streaming or preventing data loss if a recording is interrupted. : In fragmented MP4s, the file is broken