Comment 2 for bug 1161050

StacktraceTop:
 gst_thumbnailer_play_start (cancellable=0x7f04a0006b30, play=0x0) at gst-thumbnailer.c:461
 gst_thumbnailer_create (thumbnailer=0x7f04ae733de0, cancellable=0x7f04a0006b30, info=0x7f04ae7e3a80) at gst-thumbnailer.c:581
 tumbler_lifo_scheduler_thread (data=0x7f04ae7e3cd0, user_data=0x7f04a00050c0) at tumbler-lifo-scheduler.c:495
 g_thread_pool_new (func=<optimized out>, user_data=<optimized out>, max_threads=<optimized out>, exclusive=<optimized out>, error=<optimized out>) at /build/buildd/glib2.0-2.36.0/./glib/gthreadpool.c:513
 start_thread (arg=0x7f04a5614700) at pthread_create.c:311