[Bug 754178] uridecodebin: gst-discoverer doesn't detect both audio and video of RTSP streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754178

--- Comment #28 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
> As we increment ->pending along with prepending to the list of decodebins, I
> think checking for it and for "all_topos" is redundant ?

Actually I just realized pending was also incremented when the source has
dynamic pads, which is our case here, and this protects us from a race where
the first decodebin would post a topology before the source had exposed all its
pads, leading to a not empty but still incomplete topology, accepted commit now
then :D

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