[Bug 700600] videomixer: Fix races in caps negotiation and re enable the unit test

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=700600
  GStreamer | gst-plugins-good | 1.x

Nicolas Dufresne <nicolas.dufresne> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #6 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2013-05-18 22:03:34 UTC ---
This is a dup of https://bugzilla.gnome.org/show_bug.cgi?id=684237

After some testing, it seems better, though I still get the following pipeline
to fail from time to time:

gst-launch-1.0 videotestsrc num-buffers=1 ! mix. videotestsrc num-buffers=1 !
alpha alpha=0.5 ! mix. videotestsrc num-buffers=1 ! mix. videomixer name=mix !
videoconvert ! xvimagesink

So I'm wondering if the re-enabled test won't fail also from time to time.

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