[Bug 657809] Playback sometimes start without sound

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=657809
  GStreamer | don't know | 0.10.34

--- Comment #3 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2011-08-31 14:24:24 UTC ---
This stream has two audio tracks. One of them seems silent as far as I can
tell, and is tagged "visually impaired commentary". I guess it will have audio
on selected parts of the stream only, where it makes sense and commentary of
the program is available. 

The random selection of a default stream is a known long standing bug.
See for instance https://bugzilla.gnome.org/show_bug.cgi?id=607466, I'm pretty
sure there's a much older bug about it I can't find, but basically it's a race
between threads, and the one selected is (IIRC) the first one to expose its
source pad.

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