[Ffmpeg-devel] global headers

[Michael Niedermayer]

Hi

On Tue, Mar 14, 2006 at 12:08:50AM +0000, M?ns Rullg?rd wrote:
> Loren Merritt <lorenm at u.washington.edu> writes:
> 
> > On Mon, 13 Mar 2006, Michael Niedermayer wrote:
> >
> >> what about letting encoders always generate global headers / set extradata?
> >> currently it needs CODEC_FLAG_GLOBAL_HEADER to be set, which well, is
> >> annoying from a encoder - muxer seperation POV
> >>
> >> objections, comments?
> >
> > Then it would be the muxer's job to interleave the headers into the
> > stream if it doesn't want global headers? Are there any codecs where
> > that doesn't consist of "prepend a copy of extradata to each keyframe"?
> 
> Yes, AAC (what else?).  The format of the global header is different
> from the frame header used with any of the stream formats (ADTS, ...)
> used either raw or in program/transport streams.

hmm, what is the difference?
could we use the same format and convert the global one in the mov/mp4
(de)muxer?

[...]

-- 
Michael