2 ms·
Not 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 impleme
by koito17 3y ago
Not 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, ...)