g_value_init(&disp_par, GST_TYPE_FRACTION);
gst_value_set_fraction(&disp_par, 1, 1);
g_object_get(ud->preview->play, "video-sink", &xover, NULL);
g_value_init(&disp_par, GST_TYPE_FRACTION);
gst_value_set_fraction(&disp_par, 1, 1);
g_object_get(ud->preview->play, "video-sink", &xover, NULL);