v4l2videodec: treat MPEG-1 format as MPEG-2
The current code treats mpeg1 as mpeg4, but if it's more reasonable to treat mpeg1 as mpeg2?
if (mpegversion == 2) {
SET_META ("MPEG2");
cdata->codec = gst_v4l2_mpeg2_get_codec ();
} else {
SET_META ("MPEG4");
cdata->codec = gst_v4l2_mpeg4_get_codec ();
}