[vlc-devel] [PATCH] Merge VoD module into RTP stream output module

[Pierre Ynard]

> Le samedi 30 octobre 2010 09:00:29 Pierre Ynard, vous avez écrit :
> > > Why do you need to a specific PTS?
> > 
> > The RTSP headers already give the initial RTP timestamps to the
> > client, before the instance and the rtp sout are started. So I need
> > to use a common reference, and I need to pass it somewhere.
> 
> Might as well create a value that can be recomputed from the infos
> that the vod stream already has. The use of mdate() was purely
> arbitrary.

Yeah, I guess the timestamp can be derived from the p_media address
and/or the session identifier. Any security issue with that?

> > We could also implement streaming several payload types in the same
> > RTP session,
> 
> Yes, but that's rarely useful. First, the design of RTP implicitly
> limits this to payload types with equal timestamp frequency. Otherwise
> delay jitter computations and synchronization would go crazy. Second,
> I have to expect many receivers will fail miserably, including current
> VLC.

RFC 3550 §5.2 suggests using different SSRC for each payload type in the
same RTP session to avoid these problems.

-- 
Pierre Ynard
"Une âme dans un corps, c'est comme un dessin sur une feuille de papier."