GST_BUFFER_TIMESTAMP (outbuf));if(GST_CLOCK_TIME_IS_VALID (stream_time))gst_object_sync_values(GST_OBJECT (trans), stream_time);/* now properties have been sync'ed; maybe need to update composition */GST_OBJECT_LOCK (overlay);if(G_UNLIKELY (overlay->update_composition)) { gst_gdk_p...