//g_object_set(G_OBJECT(xover), "force-aspect-ratio", TRUE, NULL);
bus = gst_pipeline_get_bus(GST_PIPELINE(ud->preview->play));
gst_bus_add_watch(bus, live_preview_cb, ud);
gst_bus_set_sync_handler(bus, create_window, ud->preview);
gst_object_unref(bus);
//g_object_set(G_OBJECT(xover), "force-aspect-ratio", TRUE, NULL);
bus = gst_pipeline_get_bus(GST_PIPELINE(ud->preview->play));
gst_bus_add_watch(bus, live_preview_cb, ud);
gst_bus_set_sync_handler(bus, create_window, ud->preview);
gst_object_unref(bus);