[Bug 781170] glimagesink: displays no window on macOS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781170

--- Comment #6 from Florian Zwoch <fzwoch at gmail.com> ---
Right, here is a new trace:

(lldb) bt all
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007fffb9e6aeb6 libsystem_kernel.dylib`__select + 10
    frame #1: 0x00000001002a7491 libglib-2.0.0.dylib`g_poll + 433
    frame #2: 0x00000001002983c4 libglib-2.0.0.dylib`g_main_context_iterate +
340
    frame #3: 0x000000010029873f libglib-2.0.0.dylib`g_main_loop_run + 223
    frame #4: 0x00000001000b0b8b libgstreamer-1.0.0.dylib`gst_bus_poll + 283
    frame #5: 0x000000010000505d gst-launch-1.0`event_loop + 3485
    frame #6: 0x0000000100003ba8 gst-launch-1.0`main + 1768
    frame #7: 0x00007fffb9d3c235 libdyld.dylib`start + 1
    frame #8: 0x00007fffb9d3c235 libdyld.dylib`start + 1

  thread #2
    frame #0: 0x00007fffb9e6b44e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fffb9f55502 libsystem_pthread.dylib`_pthread_wqthread +
1023
    frame #2: 0x00007fffb9f550f1 libsystem_pthread.dylib`start_wqthread + 13

  thread #3
    frame #0: 0x00007fffb9e6b44e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fffb9f55695 libsystem_pthread.dylib`_pthread_wqthread +
1426
    frame #2: 0x00007fffb9f550f1 libsystem_pthread.dylib`start_wqthread + 13

  thread #4
    frame #0: 0x00007fffb9e6b44e libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fffb9f55695 libsystem_pthread.dylib`_pthread_wqthread +
1426
    frame #2: 0x00007fffb9f550f1 libsystem_pthread.dylib`start_wqthread + 13

  thread #6, name = 'videotestsrc0:src'
    frame #0: 0x00007fffb9e6abf2 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fffb9f5686e libsystem_pthread.dylib`_pthread_cond_wait +
712
    frame #2: 0x00007fffa5ffbd2b Foundation`-[NSCondition wait] + 240
    frame #3: 0x00007fffa5ffade8
Foundation`-[NSObject(NSThreadPerformAdditions)
performSelector:onThread:withObject:waitUntilDone:modes:] + 904
    frame #4: 0x00007fffa607b8c7
Foundation`-[NSObject(NSThreadPerformAdditions)
performSelector:onThread:withObject:waitUntilDone:] + 119
    frame #5: 0x00000001004e5228
libgstosxvideosink.so`gst_osx_video_sink_setcaps + 392
    frame #6: 0x000000010048d106
libgstbase-1.0.0.dylib`gst_base_sink_default_event + 1014
    frame #7: 0x000000010048dda0 libgstbase-1.0.0.dylib`gst_base_sink_event +
176
    frame #8: 0x00000001000e8d05
libgstreamer-1.0.0.dylib`gst_pad_send_event_unchecked + 1173
    frame #9: 0x00000001000e8126
libgstreamer-1.0.0.dylib`gst_pad_push_event_unchecked + 710
    frame #10: 0x00000001000eb0ab libgstreamer-1.0.0.dylib`push_sticky + 203
    frame #11: 0x00000001000e3986 libgstreamer-1.0.0.dylib`events_foreach + 150
    frame #12: 0x00000001000e488b libgstreamer-1.0.0.dylib`check_sticky + 91
    frame #13: 0x00000001000e7bb6 libgstreamer-1.0.0.dylib`gst_pad_push_event +
518
    frame #14: 0x00000001004961ef libgstbase-1.0.0.dylib`gst_base_src_set_caps
+ 191
    frame #15: 0x0000000100498120
libgstbase-1.0.0.dylib`gst_base_src_default_negotiate + 368
    frame #16: 0x000000010049a322 libgstbase-1.0.0.dylib`gst_base_src_loop +
194
    frame #17: 0x000000010011505b libgstreamer-1.0.0.dylib`gst_task_func + 251
    frame #18: 0x00000001002c14a2
libglib-2.0.0.dylib`g_thread_pool_thread_proxy + 50
    frame #19: 0x00000001002c050a libglib-2.0.0.dylib`g_thread_proxy + 90
    frame #20: 0x00007fffb9f559af libsystem_pthread.dylib`_pthread_body + 180
    frame #21: 0x00007fffb9f558fb libsystem_pthread.dylib`_pthread_start + 286
    frame #22: 0x00007fffb9f55101 libsystem_pthread.dylib`thread_start + 13

  thread #7, name = 'gmain'
    frame #0: 0x00007fffb9e6aeb6 libsystem_kernel.dylib`__select + 10
    frame #1: 0x00000001002a7491 libglib-2.0.0.dylib`g_poll + 433
    frame #2: 0x00000001002983c4 libglib-2.0.0.dylib`g_main_context_iterate +
340
    frame #3: 0x00000001002984a4 libglib-2.0.0.dylib`g_main_context_iteration +
100
    frame #4: 0x0000000100299c46 libglib-2.0.0.dylib`glib_worker_main + 54
    frame #5: 0x00000001002c050a libglib-2.0.0.dylib`g_thread_proxy + 90
    frame #6: 0x00007fffb9f559af libsystem_pthread.dylib`_pthread_body + 180
    frame #7: 0x00007fffb9f558fb libsystem_pthread.dylib`_pthread_start + 286
    frame #8: 0x00007fffb9f55101 libsystem_pthread.dylib`thread_start + 13

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