Original commit message from CVS:
2004-01-04 Ronald Bultje <rbultje@ronald.bitfreak.net>
* ext/xvid/gstxviddec.c: (gst_xviddec_init),
(gst_xviddec_src_getcaps), (gst_xviddec_src_link),
(gst_xviddec_sink_link):
Implement src_getcaps() so proper size caps is negotiated.