[Bug 741864] New: RTCP is broken

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741864
  GStreamer | gst-plugins-good | git

           Summary: RTCP is broken
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: marc.leeman at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I've noticed that the RTCP packets in current git code are no longer being sent
to a multicast address. 

This is, two of them are sent, then silence.

The setup is that an RTP stream is sent to a MC address

239.1.2.3:1234

and the RTCP packets are sent to port+1

239.1.2.3:1235

When I started debugging, I noticed that rtpsession generates and sends 2 RTCP
packets. It also receives the packets it sent to the multicast address.

Since the packets sent and the packets received have the same SSRC, it marks
them as a collision and sends an EOS on the RTCP pad.

While the RTP session still generateds RTCP packets, the pad ignores and frees
them because of the EOS.

rtpmanager/rtpsession.c check_collision is too strict IMO (since it cannot
figure out if it is sent to MC or not).

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