http://bugs.winehq.org/show_bug.cgi?id=58241
--- Comment #4 from Rafał Mużyło galtgendo@o2.pl --- (In reply to wine from comment #3)
0:00:00.004211047 5092 0x7dd0b180 ERROR WINE wg_transform.c:737:wg_transform_create: Failed to create winegstreamer transform. 01a4:err:winediag:h264_encoder_create GStreamer doesn't support H.264 encoding, please install appropriate plugins
Could this be causing the problem? And how can I fix it?
Difficult to tell - hangs are often difficult to diagnose, even when you're using a debugger to look at the backtrace of all the threads; without that you're left with reading the tea leaves.
When it comes to that plugin, it's either gst-plugins-libav or openh264dec from gst-plugins-bad (well, perhaps there are more h264 gstreamer plugins, but usually with video the libav one is the best bet (as long as your ffmpeg has the needed codec)).