> Date: Mon, 23 Nov 2009 18:53:45 -0800
> From: "Tony Ross" <[email protected]>
> After more experimentation, I find that the wide, vertical black band on
the
> left side is a feature of the original VHS tape, which was recorded from a
> PBS master 1/2" reel tape. I'm not sure why it doesn't show when the VHS
is
> displayed on a televion, but perhaps there're more than 720 pixels width?
Maybe something went wrong with the front porch, causing sync issues?
http://www.kolumbus.fi/pami1/video/pal_ntsc.html or
http://www.ntsc-tv.com/ntsc-main-03.htm may be helpful
(or a search for ``ntsc "front porch"''). Just a guess,
but a tape-to-tape from 1/2" (U-matic, by any chance?)
seems fraught...
(Really, weirdness in any portion of the sync might lead to strange
issues, and I'll bet that a capture card, a VCR, or a TV might display
different symptoms. You may need a timebase corrector, or perhaps
something that claims to de-Macrovision may help by restoring your
sync to something more reasonable. Any chance you can look at the
signal on an oscilloscope?)
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