[Bug 771530] Multicast interface not used for group join setsockopt call

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771530

--- Comment #1 from Arkver <ian.arkver.dev at gmail.com> ---
I added a little debug to gstmultiudpsink.c where it calls the group join...

      GST_DEBUG_OBJECT (sink, "autojoining group on iface %s",
              sink->multi_iface);
      if (!g_socket_join_multicast_group (socket, addr, FALSE,
              sink->multi_iface, &err))

And get this...

0:00:21.526560977   532 0xb5215a00 DEBUG           multiudpsink
gstmultiudpsink.c:1256:gst_multiudpsink_configure_client:<multiudpsink1>
autojoining group on iface 192.168.9.102

[pid   544] setsockopt(20, SOL_IP, IP_ADD_MEMBERSHIP,
{imr_multiaddr=inet_addr("239.255.7.0"), imr_interface=inet_addr("0.0.0.0")},
12) = -1 ENODEV (No such device)

0:00:21.896296692   532 0xb5215a00 WARN            multiudpsink
gstmultiudpsink.c:1277:gst_multiudpsink_configure_client:<multiudpsink1> error:
Could not join multicast group: Error joining multicast group: No such device

So it looks like the multi_iface property is set OK and it's the underlying
glib call that's broken. :-(

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