[Bug 767712] gst-launch / alpha: Launching the example alpha pipeline results in a segfault

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767712

--- Comment #5 from Duncan Palmer <dunk.palmer at gmail.com> ---
Nicolas, I know that backtrace is surprisingly useless; I'm not sure why it
fails where it does, but I do have debug symbols installed.

I've had a bit more of a play with this, and I've noticed that the problem is
reproducible only when I use an xvimagesink (which is what autovideosink uses
in my case); ximagesink and glimagesink work fine.

A more concise way of reproducing the problem is 

gst-launch-1.0 videotestsrc ! alpha ! videomixer ! videoconvert ! xvimagesink

Using this method, I get a useful backtrace (attached). It would appear this
problem is related to a specific colour space conversion.

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