[Bug 791743] Multicast TTL not set on stream sockets correctly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791743

--- Comment #2 from Arkver <ian.arkver.dev at gmail.com> ---
Not sure the behaviour will be the same with master code, since it seems to
have changed to only create the sockets when a client connects, presumably to
support using client info for things like ttl. I tried to build and run
examples/test-multicast with a fresh master build but I get an assertion
failure. This is current clean master branch code for
gstreamer/plugins-[base|good|ugly]/gst-rtsp-server all as of about an hour ago.
gst-rtsp-server is at 64f1a3a.

0:00:02.811077700  8968 0x55c951eaf5e0 INFO              rtspclient
rtsp-client.c:3401:handle_request: client 0x55c951f38110: received a request
PLAY rtsp://127.0.0.1:8554/test/ 1.0
0:00:02.811088711  8968 0x55c951eaf5e0 LOG               rtspclient
rtsp-client.c:1088:default_pre_signal_handler:<GstRTSPClient at 0x55c951f38110>
returning GST_RTSP_STS_OK
0:00:02.811094907  8968 0x55c951eaf5e0 DEBUG              rtspmedia
rtsp-media.c:4081:gst_rtsp_media_complete_pipeline:<GstRTSPMedia at 0x7fc2d004a180>
complete pipeline
0:00:02.811098073  8968 0x55c951eaf5e0 DEBUG             rtspstream
rtsp-stream.c:4523:gst_rtsp_stream_complete_stream:<GstRTSPStream at 0x7fc2d0050300>
complete stream
0:00:02.811100746  8968 0x55c951eaf5e0 DEBUG             rtspstream
rtsp-stream.c:2906:create_receiver_part:<GstRTSPStream at 0x7fc2d0050300> create
receiver part
0:00:02.811160858  8968 0x55c951eaf5e0 DEBUG             rtspstream
rtsp-stream.c:2972:create_receiver_part:<GstRTSPStream at 0x7fc2d0050300> mcast
IPv4, create and configure udpsources
**
ERROR:rtsp-stream.c:1261:create_and_configure_udpsource: assertion failed:
(socket != NULL)

Client is VLC in this case.

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