Does it matter if the format of tape changes?
No. Again, as long as nothing blocks or interferes with line 21, closed captions will be copied along with the video. Be aware, though, that many DV formats may need you to enable line 21.
No. Again, as long as nothing blocks or interferes with line 21, closed captions will be copied along with the video. Be aware, though, that many DV formats may need you to enable line 21.