codec - The reason for a 'free' box in an ISO BMFF or MP4 file? -


it's easy spot free box in .mp4 (or iso bmff) file. i'm wondering reason box. sort of padding file size? sometimes, spotted 2 consecutive free boxes!

the following partial info mp4dump

[ftyp] size=8+20   major_brand = iso5   minor_version = 0   compatible_brand = avc1   compatible_brand = iso5   compatible_brand = dash [free] size=8+17 [moov] size=8+637   [mvhd] size=12+108, version=1     timescale = 24000     duration = 14315000     duration(ms) = 596458

there padding boxes, other sections can correctly aligned (it ease updates).


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