[Bug 737868] rtspsrc: make sure source pads have always the right caps

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737868
  GStreamer | gst-plugins-good | git

--- Comment #3 from Aleix Conchillo Flaqué <aconchillo at gmail.com> 2014-10-06 05:55:47 UTC ---
For some reason that I still not understand, a query caps is not propagated and
"notify::caps" from session->recv_rtp_sink (caps_changed callback in rtpbin.c)
never happens. Because we have the srtp decoder which would return 
application/x-rtp and that is not returned, we end up in request_pt_map in
rtspsrc which returns the caps from the stream (application/x-srtp) and those
will be always wrong when dealing with SRTP.

My guess is something related to the internalsrc_%u pads. But I can't see
what's wrong.

So, my questions are:

(1) Why query caps is not propagated so srtpdec returns application/x-rtp and
"notify::caps" is emitted?

(2) Is (1) always supposed to work? If so, why do we need to implement
request_pt_map in the rtspsrc? I assume it's not suppose to always work...

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