[Ffmpeg-devel] Re: Re: Re: [theora-dev] Theora encoding in FFmpeg

[Michael Niedermayer]

Hi

On Mon, Jan 01, 2007 at 12:47:52PM +0100, Diego Biurrun wrote:
> On Sun, Dec 31, 2006 at 09:17:52PM +0100, Michael Niedermayer wrote:
> > 
> > On Sun, Dec 31, 2006 at 08:09:54PM +0000, Paul Richards wrote:
> > > On 31/12/06, Michael Niedermayer <michaelni at gmx.at> wrote:
> > > >On Sun, Dec 31, 2006 at 05:56:11PM +0000, Paul Richards wrote:
> > > >> And on a deeper level..
> > > >>
> > > >> Why is all this special packing of the output from theora_encode_***()
> > > >> into the extradata required?  I naively assumed that any packing like
> > > >> this would be the responsibility of the muxer...
> > > >
> > > >no of course not, just think about this for a moment, should the avi muxer
> > > >contain code to repackage theora, vorbis, ... headers? then what about
> > > >matroska, nut, asf, mov, mp4, ... ? should every muxer contain (duplicated)
> > > >code to pack all the codec specific xiph headers into a single packet?
> > > >
> > > >and then after you duplicated that code in every muxer, you will have to
> > > >add code to every corresponding demuxer to undo it otherwise you cannot
> > > >copy a stream between 2 containers witout reencoding ...
> > > >
> > > >simply putting the (de)packaging code into the 2 or 3 xiph codecs is much
> > > >easier ...
> > > >
> > > 
> > > In that case shouldn't there be a function in libtheora to concatenate
> > > all of the "extradata" packets together in a container-insensitive
> > > way?
> > 
> > yes, and this container-insensitive way should be documented in the 
> > theora/vorbis/... spec
> > iam sure many people would be happy if this would happen ...
> 
> If you guys don't keep the xiph lists in the CC, they will never read
> this, though ...

oops i didnt realize that theora-dev at xiph.org was in the CC

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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