[Bug 664711] sdlvideosink segfault after the second instance

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=664711
  GStreamer | gst-plugins-bad | git

--- Comment #2 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2012-01-31 12:58:14 UTC ---
Looking some more into it, I get a crash inside SDL_SetVideoMode on the second
sink.

I found a mention of "Don't call SDL video/event functions from separate
threads" in the SDL docs, but it's unclear whether it would or would not work
if one were to have a global mutex to ensure only one SDL function could run at
any one time.

The easiest option would be to prevent more than one SDL video sink to be in >
NULL at the same time, but may be too restrictive.

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