If you have roughly the same number of ftyp, moov and mdat tags on a disk, it is likely that they are encapsulated.
ftyp are normally only 0x14 to 0x24 bytes long
moov atoms have a structure that will be consistent for the video recorder, and will have
groups of data preceded by 4 byte tags
mdat often looks like random data, the headers for audio and video can be 'subtle', but may just be a length which is different for every frame.
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