Original commit message from CVS:
Set the rank so it can be autoplugged
factory = gst_element_factory_new("dvdec", GST_TYPE_DVDEC, &dvdec_details);
g_return_val_if_fail(factory != NULL, FALSE);
+ gst_element_factory_set_rank (factory, GST_ELEMENT_RANK_PRIMARY);
/* The pad templates can be easily generated from the factories above,
* and then added to the list of padtemplates for the elementfactory.
* Note that the generated padtemplates are stored in static global