[Bug 776540] New: GstGL: Occasional assertion failures on GST_IS_GL_DISPLAY and GST_IS_GL_CONTEXT

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776540

            Bug ID: 776540
           Summary: GstGL: Occasional assertion failures on
                    GST_IS_GL_DISPLAY and GST_IS_GL_CONTEXT
    Classification: Platform
           Product: GStreamer
           Version: 1.10.2
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: petroskataras at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 342522
  --> https://bugzilla.gnome.org/attachment.cgi?id=342522&action=edit
GST_DEBUG=*gl:6

I am experiencing some weird behavior related to the GstGL elements when trying
to load videos in async mode ( i.e not blocking the pipeline until its
pre-rolled ).

More specifically I occasionally get : 

** (<unknown>:65255): CRITICAL **: gst_gl_context_get_display: assertion
'GST_IS_GL_CONTEXT (context)' failed

** (<unknown>:65255): CRITICAL **: gst_gl_display_get_handle_type: assertion
'GST_IS_GL_DISPLAY (display)' failed

(<unknown>:65255): GStreamer-CRITICAL **: gst_object_unref: assertion 'object
!= NULL' failed

(<unknown>:65255): GStreamer-CRITICAL **: gst_object_unref: assertion 'object
!= NULL' failed

and / or 

(<unknown>:65255): GStreamer-CRITICAL **: invalid unclassed object pointer for
value type 'GstGLDisplay'

These assertion failures show up in a non-consistent way and although the
application most of the times will still continue properly there are other
times where it will just fail an abort. What is interesting is that if I export
GST_DEBUG=*gl:6 to try and observe what is happening the application will fail
after some reloads with:

** (<unknown>:64943): CRITICAL **: gst_gl_context_fill_info: assertion
'context->priv->active_thread == g_thread_self ()' failed
**
ERROR:gstglcontext.c:1252:gst_gl_context_create_thread: assertion failed:
(error == NULL || *error != NULL)

Attached you can find the log output of such a failure configured with
GST_DEBUG=*gl:6.

Again, this does not manifest if I block the pipeline until its pre-rolled .

I ve been seeing this behavior on both OS X and Linux but I m currently testing
on OS X.

The player is playbin based and is located here :

https://github.com/PetrosKataras/Cinder/blob/master/src/cinder/linux/GstPlayer.cpp

with the relevant parts of initializing and setting the GL components :

https://github.com/PetrosKataras/Cinder/blob/master/src/cinder/linux/GstPlayer.cpp#L168-L193

https://github.com/PetrosKataras/Cinder/blob/master/src/cinder/linux/GstPlayer.cpp#L465-L503

https://github.com/PetrosKataras/Cinder/blob/master/src/cinder/linux/GstPlayer.cpp#L561-L585

I would really appreciate any clues on this..

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