[Bug 787522] New: v4l2sink stops to play after a few state changes between paused and playing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787522

            Bug ID: 787522
           Summary: v4l2sink stops to play after a few state changes
                    between paused and playing
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fatwildcat at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When playbin element is used with video-sink property set to v4l2sink, the
pipeline stops to play after a few changes between paused and playing. Further
switches between paused and playing state have no effect.

It looks the problem is caused by the v4l2sink element, more precisely by
gst_v4l2_object_unlock function invoked by gst_v4l2sink_unlock. The
gst_v4l2_object_unlock function invokes gst_buffer_pool_set_flushing, which
sets the pool in flushing state. This infers the pool use by other threads and
under certain circumstances may switch whole pipeline into flushing state.

When I did remove in code the gst_buffer_pool_set_flushing function call in
gst_v4l2_object_unlock function, the problem stopped to appear.

Let me know if you need more information. Thank you.

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