[Bug 731474] playbin stalls when trying to play the audio portion of a stream with flags="audio"

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731474
  GStreamer | gstreamer (core) | git

--- Comment #6 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-06-13 16:06:30 UTC ---
On second thought, it might be a multiqueue issue after all. The second
multiqueue's video queue is empty, as it pushes without sync (but the return
comes back with ok, not not-linked), so it's possible that the multiqueue does
not send a "buffering high" message to gst-launch because its video queue is
empty, so gst-launch never switches to PLAYING again - which would presumably
unblock the audio thread waiting in preroll.

However, since the pad pushes in multiqueue seem to not return not-linked, I
don't see an easy way to tell whethe to ignore a given single queue in the
buffering level calculation. I guess I could hardcode it based on caps to test
the theory first though.

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