[Bug 793224] New: gl: context persistence issue

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793224

            Bug ID: 793224
           Summary: gl: context persistence issue
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: philn at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I have an issue where my custom playbin video sink (glupload ! glcolorconvert !
appsink) loses its context when the video chain is removed from playsink while
the whole pipeline goes to READY.

So rendering works fine on first run, the app handles the need-context message
fine. On second run the gl elements try a context query, that fails. Then they
try to post a need-context message but they have no bus associated yet, so that
fails. Then a new display is created from gst_gl_ensure_element_data() and it's
for the wrong platform (egl vs wayland).

But even with all those failures, somehow rendering works if the pipeline goes
to PLAYING again.

On third run rendering fails.

As a workaround I can manually set the context on the video sink before going
to PAUSED on second and following runs but shouldn't the gl context be
automatically reused from the persistent element context?

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