[Bug 776314] New: rtspsrc: suggest multicast but do not require it

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776314

            Bug ID: 776314
           Summary: rtspsrc: suggest multicast but do not require it
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 342267
  --> https://bugzilla.gnome.org/attachment.cgi?id=342267&action=edit
logs

rtsp stream from a particular camera works fine with vlc but not with
gstreamer, here are the relevant manufacter documentation

"""
The RTSP server handles SETUP requests with multiple transport suggestions. The
first transport
possible will be chosen by the server. This allows a client to implement a
seamless automatic
‘prefer multicast over unicast’ scenario. This in turn yields a system that
makes efficient use of
bandwidth if possible (multicast), while still guaranteeing delivery of video
if not (unicast).
To do so, a client needs to specify a multicast transport first and unicast as
second, as fallback
option. If the encoder has a multicast stream available, it responds with the
multicast connection
parameters. If it hasn't, it responds with unicast connection parameters.
Not every RTSP client available supports this behaviour
"""

If a multicast address is given inside the sdp gstreamer only try multicast and
if no data can be received it errors out this way:

Could not connect to server, no protocols left

gstreamer logs attached

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