I have had a lot of trouble capturing Sega Saturn screenshots via DV hardware. Actually, that’s an understatement– I have had absolutely no luck capturing thus far. That was with the standard composite cables that came with the unit. My last ditch effort was to procure an S-video Saturn cable, which arrived today. Works beautifully:
I’m in business now. This is great news since I currently have 26 Saturn titles on my master spreadsheet that are missing screenshots in the database.