[Bug 654464] New: udpsrc conflict with rtsp and multicast due to two-phase setup

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=654464
  GStreamer | gst-plugins-good | 0.10.29

           Summary: udpsrc conflict with rtsp and multicast due to
                    two-phase setup
    Classification: Platform
           Product: GStreamer
           Version: 0.10.29
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          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: ---


This setup is about two RTSP enabled cameras; but they do not allow any port
negociation.

We access two identical encoders via RTSP; that have the same settings:
uri-in=rtsp://10.3.0.48:7070 protocols=2
uri-in=rtsp://10.3.0.171:7070 protocols=2

When the first camera is accessed; the RTSP negociation finally lands on the
correct combination when fixing the port-range on the decoder side.

The second encoder poses a problem due to the RTSP setup process.
The RTSP session is started in two phases.

In a first phase; the unicast UDP ports are opened (shared=0) which fails
because these ports are already in use by the first client.
The second phase; where the multicast sockets are opened (udpsrc shared=1) is
never executed since the result of the first setup is a range of ports
incompatible with what the encoder is willing to provide; while technically
there should not be an issue.

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