[FFmpeg-devel] [rfc] Applehttp proto documentation Was: [FFmpeg-commits] Add Apple HTTP Live Streaming protocol handler

[Stefano Sabatini]

On date Monday 2011-03-07 12:47:32 +0200, Martin Storsj? encoded:
> On Mon, 7 Mar 2011, Stefano Sabatini wrote:
> 
> > BTW would it make sense to integrate the Chase Douglas mpegts
> > segmenter:
> > http://svn.assembla.com/svn/legend/segmenter/segmenter.c
> > 
> > in tools, or would be better implement it as a write protocol?
> 
> Hmm, as a write protocol would be interesting, but I'm not sure if it's 
> feasible. I guess the mpegts muxer outputs "headers" (whatever that's 
> called in mpegts terminology) regularly? Ideally, when cutting segments, 
> new headers would be output at the start of each segment, to ease starting 
> decoding from that point (which the segmenter above doesn't do, iirc). Is 
> there a convenient way to trigger emission of such headers at a certain 
> point?

Currently AVOutputFormat.write_header() initializes the de/muxer and
writes the header (if any), similarly AVOutputFormat.write_trailer()
writes the trailer (if any) and uninit the de/muxer.

We could split the two functions, i.e. have a separate
AVOutputFormat.init() and AVOutputFormat.uninit() callbacks. I suppose
this implies a major revamp of all the de/muxers.

Or we could add an argument to write_header/trailer():
int av_write_header2(AVFormatContext *s, int init);
int av_write_trailer2(AVFormatContext *s, int uninit);

when init is set to 1 the muxer is initialized before to write the
header.
-- 
FFmpeg = Faithless and Free Multimedia Problematic Everlasting Goblin