Most of the cheap ways of capturing analog video will end up dropping half the image data before the process even starts.

At a minimum, full SD-resolution capture is necessary. 480 lines and whatever seems reasonable (for VHS, doubt there's much of a difference between 640 and 704/720).

Capture such material at 240 lines and you might as well not be capturing it at all.

It's somewhat involved to make archival-quality digitizations.