[FFmpeg-devel] [PATCH] Fix client's SSRC in RTCP RR packets

[Martin Storsjö]

On Wed, 21 Jul 2010, Luca Abeni wrote:

> the code currently used by rtpdec.c to generate an RTCP RR
> packet uses the server's SSRC (stored in RTPDemuxContext:ssrc
> by rtp_parse_packet()) as a "SSRC of packet sender" (which
> should be the client's SSRC).
> 
> As a result, the server sees the RTCP RR packets arriving
> with its own SSRC... Some RTSP servers just don't care, some
> other servers discard these RTCP RR packets as non valid
> (I've been told that Axis servers do this), and do not see
> any RR packet from the client... So, they end up closing the
> RTP session after a short timeout.
> 
> I've seen some reports of this problem, so I am sending a
> simple patch, which uses the server SSRC + 1 as a client SSRC.

Sounds sensible to me.

// Martin