[FFmpeg-devel] rtpdec.c: AXIS 7401 RTCP RR Keep Alive SSRC

Ed Patton ejpatton6
Fri Aug 14 18:34:23 CEST 2009

Hi Luca

The bin worked, but I think there will be a problem when multiple users access the video server. The problem will be that each ffmpeg client will have the same SSRC. I wasn't able to test it, but it would violate the requirement that each client(s)/server have a different SSRC.


From: Luca Abeni  <lucabe72 at email.it> 
To: ffmpeg-devel at mplayerhq.hu; libav-user at mplayerhq.hu
Sent: Saturday, July 25, 2009 12:37:47AM
Subject: [FFmpeg-devel] rtpdec.c: AXIS 7401 RTCP RR Keep Alive SSRC

Hi Edward,

On Wed, 2009-07-22 at 13:35 -0700, Edward Patton wrote:
> Hi
> I made this change to prevent the AXIS 7401 video server from timing out when sending H264 RTP streamed video. It appears the AXIS ignores the clients SSRC when it is the same as the servers SSRC. I fixed the client SSRC, but its supposed to be a random value (but fixed for the session). Furthermore, the code should really check to see if the client/server's SSRC's match and then select a new one. For our application, it seems to work OK with a fixed SSRC.
> This change may be at least better than what is currently in the code base. Should it be a patch?

Can you test the attached patch? I expect it to work, but I prefer to be
sure (and I have no AXIS servers for testing).


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