http://bugs.winehq.org/show_bug.cgi?id=30557
--- Comment #86 from Hector Martin marcan@marcansoft.com 2013-11-10 06:32:47 CST --- If you get the "GThread system no longer supports custom thread implementations." message then you can expect any kind of weird crash when gstreamer is used. This results in mixing pthreads and Windows threads inside callbacks to Wine and all kinds of strange failure modes are to be expected.