Capture cards: Osprey-210, LeadTek Winfast PVR, and an MPEG card that I don't typically use because of the compression.
Codec is Lagarith lossless (typically RGB); but the lines show up in capture programs' preview window, so I don't think it is codec. I've used VirtualDub and
Nero to capture.
I may have to try these cards in a different PC and see if I get the same result. The lines are completely random, which lends itself toward the heads of the VCR, but after hooking up the TV, I'm sure the problem is in the PC, somewhere.
It IS possible to have three bad capture cards, I suppose. That would not be unusual for the kind of luck I have, sometimes.