Original commit message from CVS:
add ranks only for plugins who participate in autoplugging. If you have a file that used to autoplug but doesn't anymore, then let me know or add a rank to the missing element.
dec = gst_element_factory_new("vorbisdec",GST_TYPE_VORBISDEC,
&vorbisdec_details);
g_return_val_if_fail(dec != NULL, FALSE);
+ gst_element_factory_set_rank (dec, GST_ELEMENT_RANK_PRIMARY);
/* register sink pads */
dec_sink_template = gst_pad_template_new ("sink", GST_PAD_SINK,