[net.video] problem with pre-recorded tape

hofbauer@utcsri.UUCP (John Hofbauer) (12/22/85)

I just bought my first pre-recorded tape (a collection of Disney cartoons)
and ran into an annoying problem when I played it. The image would
sometimes flutter (always vertically) and on occasion jump about
1/4 of the screen height for a split second. This seemed to get worse
towards the end of the tape. I have never encountered this problem
with tapes I've recorded from broadcasts. Can anyone offer an explanation?
Has it anything to do with the fact I have a two-head VCR?