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The QuickTime Movie container format became ISOBMFF (https://en.wikipedia.org/wiki/ISO_base_media_file_format https://en.wikipedia.org/wiki/ISO_base_media_file_
by CharlesW 3y ago
The QuickTime Movie container format became ISOBMFF (https://en.wikipedia.org/wiki/ISO_base_media_file_format https://en.wikipedia.org/wiki/ISO_base_media_file_format), which is open, and so happily has lots of open source support.
- koito17 3y agoNot to mention, it's always been easy to access the QuickTime File Format Specification, and I have seen it being used all the time by people wanting to implement MP4 (de)muxers but not having the money to buy overpriced ISO specifications or effort to hunt around for drafts of MPEG-4 Part 14. There are subtle differences in how you should lay out some atoms (e.g. ftyp is subtly different in QuickTime, MP4 uses free instead of wide atom, some Macintosh-specific fields in vmhd(?) and related atoms are always zeroed out and marked as "reserved" in MP4, etc.). But it's easy to gloss over these differences when you do not care about the Macintosh-specific things (like QuickDraw transforms, sprites, ...)