[Ffmpeg-devel] global headers

[Michael Niedermayer]

Hi

On Sun, Mar 19, 2006 at 01:33:58PM +0000, M?ns Rullg?rd wrote:
> Michael Niedermayer <michaelni at gmx.at> writes:
> 
> > Hi
> >
> > On Sun, Mar 19, 2006 at 12:05:22AM +0000, M?ns Rullg?rd wrote:
> >> Michael Niedermayer <michaelni at gmx.at> writes:
> >> 
> >> > could we use the same format and convert the global one in the mov/mp4
> >> > (de)muxer?
> >> 
> >> We're doing the opposite right now.  I don't like this, since
> >> whichever way it's done, several muxers will need to do the
> >> conversion.  E.g. ADTS format is required for raw ADTS, MPEG-TS and
> >> MPEG-PS.  MP4 requires the other format.  Matroska, as is to be
> >> expected, uses it's own bastardized variant.
> >
> > fine, so what do you suggest? demuxer -> muxer must work even if the
> > AAC variants differ ...
> >
> > so if a demuxer has ADTS internally what should be done, remove ADTS
> > headers in the demuxer? in a middle layer? or the muxer?
> >
> > should it be optional or always be removed?
> > always will break if the headers change (switching channels, movies, ...)
> > allowed or not it will happen and must be supported
> 
> To me, the cleanest solution would be a middle layer for transforming
> between the different formats.  Doing it in the demuxer or muxer will
> inevitably lead to the same work being done in multiple places.

fine, do you volunteer to implement it?


> 
> Could we perhaps use AVCodecContext.sub_id here?

hmm, maybe but somehow i think its not a good idea

[...]

-- 
Michael