query = gst_query_new_seeking (GST_FORMAT_TIME);
if (gst_element_query (mp->priv->playbin, query)) {
	gst_query_parse_seeking (query, NULL, &can_seek, NULL, NULL);
} else {
	gst_query_unref (query);

	query = gst_query_new_duration (GST_FORMAT_TIME);
	can_seek = gst_element_query (mp->priv->playbin, query);
}
gst_query_unref (query);