Hi On Sun, Jul 30, 2006 at 03:41:38AM +0200, Baptiste Coudurier wrote:
Hi
Alex Beregszaszi wrote:
[...]
Quicktime lacks an unambigous place for a global header so its outside the scope of this document. we could add mov to the list of supported containers if we define a chunk for the global header, other codecs have their own codec specific global header chunks too, maybe "glbl" could be used if its not taken yet, but i need to look more carefully at the mov/qt spec so we unambiguosly define and place it
glbl below trak? vmhd/mdhd/smhd/tkhd are leaf
Humm, IMHO best place is in stsd like every other codec. Decoder
yes
specific config atom like 'dvrb'. Is MOV fourcc for vorbis defined ? I can't find it anywhere. 'vrbs' would be nice.
my post to vorbis-dev/nut-dev contained vrbs and vorbis as 4-cc and n-cc identifers, not sure if they where lost in alexs rfc conversation ...
Will some Quicktime fanatic speak up? Mike?
about .mp4, that wasnt covered by the quicktime/mov point, it has a ESDS atom into which a global header can be put, but iam not very familiar with the mpeg4-systems / iso-mp4 container specs so i didnt mention it
That ESDS looks HUGE.
MP4 specs would require it to be in stsd as 'mp4a' and object type set correctly in esds. It seems gpac already does it and uses a object type. That object type should be registered to mp4ra.org I think.
and we of course should use the same method/id gpac uses if we mention .mp4 at all [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB In the past you could go to a library and read, borrow or copy any book Today you'd get arrested for mere telling someone where the library is