https://bugs.winehq.org/show_bug.cgi?id=30557
--- Comment #124 from Andrew Eikum aeikum@codeweavers.com --- This should be fixed, please retest to confirm if you can. I'm planning to send a patch to use the gstreamer-1.0 API, so don't rush out and build 32-bit gstreamer-0.10 if you don't already have it.
commit 56b6523842f8fd9125f6d3c1651d836163dfef00 Author: Andrew Eikum aeikum@codeweavers.com Date: Tue Jan 12 13:35:04 2016 -0600
winegstreamer: Always run gstreamer callbacks on a Wine thread.