isomp4: Replace GST_VIDEO_CAPTION_TYPE_CEA608_IN_CEA708_RAW with CEA608_S334_1A

For the demuxer we have to select line offset 0 for the time being as
this information is not passed over MOV.
6 jobs for vanc-s334-1-a in 40 minutes and 47 seconds (queued for 1 second)