[Bug 683842] Fix race condition in videomixer2 on 0.10

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=683842
  GStreamer | gst-plugins-good | 0.10.x

--- Comment #2 from Youness Alaoui <youness.alaoui at collabora.co.uk> 2012-09-12 18:30:59 UTC ---
Humm... There already is a lock but it needs to be unlocked before calling the
set_caps since the setcaps function takes it back... But I think it's a good
idea to add a new lock only for the sink_setcaps purposes, this way it doesn't
need to be unlocked when we call anything and it would block the second
setcaps.
Thanks for the idea, I will implement that and send a new patch.
Could you also confirm that this thing isn't needed for GStreamer 1.0?

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