When I capture NTSC video the picture 'Rolls'

You've got a feedback loop in your set-up somewhere. OR you need a timebase corrector. Hard to tell without any more info. Like what is the deck you're using?

I don't know the deck, but what else is plugged in to or out of it?

Can you make any adjustment to the tbc?

I have that deck. It playsback NTSC, but with respect, it doesn't convert it to PAL, it outputs PAL-60, which the ADVC won't like. The signal you get has a PAL colour burst frequency - so you see the colours - but an NTSC frame rate - so it rolls. Your TV is also modern enough to display that PAL-60 signal in colour and stable, but it's NOT proper PAL.

That is your problem. You need either
(a) a real NTSC playback deck, to capture in NTSC, and edit in NTSC, or
(b) a much more expensive "real" NTSC to PAL standards conversion facility, if you must capture in PAL.

BTW: The TBC built into that deck is barely worth the name - it's a single line store, which reduces jitter at the pixel level in the display output, but it won't approach standards conversion. For that, you need an entire frame's worth (or several) of storage.

What kind of equipment would I need for option B?

Sorry, Kojima, I have no experience of actually using real NTSC to PAL standards conversion equipment - but if it doesn't cost an arm and a leg to buy/hire, it's not going to be much good! 😟

You will have to research that yourself (and maybe start a new thread?)

Also I'll need to capture a Japanese NTSC tape soon
will this also be affected by the PAL-60 problem?
(I'm guessing-yes!)

I expect your Japanese tape will have the same issues.

It might be much cheaper to get a true NTSC VHS playback deck (a plain vanilla, domestic quality one from an NTSC country) and capture and edit in NTSC, THEN convert to PAL at the end of the process (with Nattress?)

BTW: I also assume you are going from your S-VHS deck to your ADVC using S-Video (not Composite video)?

Whether you are playing back a non-S-VHS tape or a S-VHS tape, the deck will output an S-Video signal, and it's far better.

If you try and source a true NTSC VHS deck, try and find an S-VHS NTSC deck, for the same reason.