On 01/01/07, Rich Felker <dalias at aerifal.cx> 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, there certainly should be. unfortunately the xiph people, in > their infinite wisdom, are outwardly hostile to container-insensitive > things and want to make their codecs as painful as possible to use > with non-ogg containers. > > btw, is there a reason you want to use theora so much? it's not a good > codec at all.. > I have two reasons. 1) I want to show some support for a patent-free video codec. 2) Theora was quite good in a few basic tests I ran here. Compared against ffmpeg's "mpeg4" codec at 400kbit CBR, theora was clearly better. Compared against ffmpeg's "h264" (libx264), there was no clear winner (part of the problem was that I couldn't get h264 to stick to CBR). -- Paul Richards
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