[Bug 787910] New: iOS vtdec/glimagesink: CAEAGLLayer not reusable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787910

            Bug ID: 787910
           Summary: iOS vtdec/glimagesink: CAEAGLLayer not reusable
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 360070
  --> https://bugzilla.gnome.org/attachment.cgi?id=360070&action=edit
modified iOS tutorial 4 that shows the issue

On iOS a pipeline such this one:

souphttpsrc ! matroskademux ! queue ! vtdec ! glupload ! glcolorconvert !
glimagesink

works fine and the video is showed in the supplied CAEAGLLayer but if you set
the pipeline to NULL and you create it again using the same CAEAGLLayer the
pipeline run, you can hear audio but video is not refreshed, glimagesink logs
shows that the video is sent to the CAEAGLLayer.

If you replace vtdec with avdec_h264 then all is fine and the CAEAGLLayer is
reusable as expected. 

Seems something like a cleanup issue.

I can reproduce the issue using iOS tutorial 4 with small modifications. 

Please note that in the provided example you need to change this line 

g_object_set(self->pipeline, "uri", "http://192.168.1.50/test6.mkv", NULL);

to point to a reachable H.264 media

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