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What's the best resolution to capture from
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S-Video input is probably as good as it gets for the sources you mentioned. Composite will look about the same for VHS (and possibly 8mm), but not as good for the other formats (PAL composite will not affect the horizontal resolution as badly as NTSC composite, because the color modulation frequency is higher).
VHS, as we have discussed to death, has about 240 lines of (horizontal) resolution. Depending on the Extended Kell Factor you want to use, this is equivalent to about 450 horizontal pixels. So
450x480/576 is roughly equivalent (note that for most capture boards, you will want to capture at the maximum resolution and scale down with software for the best quality--details above). However, as we have discussed, 352x480/576 may be sufficiently close for your purposes.
S-VHS has about 400 lines of (horizontal) resolution. Using the same Extended Kell Factor, this is roughly equivalent to 750 horizontal pixels (this is one of the reasons why I tend to use a smaller EKF). So for S-VHS, use
720x480/576 (obviously if your card can only capture 640x480, then you use that; if you card can do 768x576 then use this).
As I understand it,
8mm has about the
same resolution as VHS, so use the same numbers.
Hi8 has about the
same resolution as S-VHS, so use the same numbers.
Hi8XR looks like a slight improvement on Hi8, giving about 440 lines of (horizontal) resolution. Since you are normally maxed out by Hi8, then you should
use the same resolution as S-VHS as well.
Xesdeeni