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

Paul Richards paul.richards
Sun Dec 31 21:09:54 CET 2006

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

Paul Richards

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