grisan said:
The BT878 is a pretty dated chip, do you have another capture card? Years ago I replaced my BT878 card with an SAA7134 based card and the difference in picture quality was pretty big.
Yes I have a newer card, based on the SAA7231 chip. I'm going to do some tests with my other LD player first (an analogue-only V4100) then swap the cards over and test again.