A moov box at byte 28 did not make this MP4 a faststart file

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Both MP4 exports put their moov box at byte 28. That looked like a convenient answer to the question I was checking: would the player have to fetch the end of the file before it could start? But the next boxes changed the interpretation. These files contained repeated moof and mdat pairs, followed by mfra. Calling them ordinary faststart MP4s would have discarded the most useful part of the inspection.

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