g_signal_connect (vsink,"handoff", G_CALLBACK (buffers_cb), state);gst_pad_add_probe(gst_element_get_static_pad (vsink,"sink"), GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM, events_cb, state,NULL);gst_pad_add_probe(gst_element_get_static_pad (vsink,"sink"), GST_PAD_PROBE_TYPE_QUERY_DO...