Purple lines when viewing standalone DVD thru my cap-card

[crudux-cruo]

Hallo,

I'm trying to capture DVD video using composite. But I get these
purple horizontal lines when viewing the video on my PC. The video looks fine other than the purple lines. This happens when the settings are for both overlay and not. I'm wondering, would buying an s-video cable clear this up?
Has anyone else experienced this?

Thanks

[crudux-cruo]

Follow up-

Seems it has to do with the particular DVD. I get the purple lines when watching U2 concert DVD, but I just got The Matrix and I don't get the lines. I wonder why that is. Hmmmmmmmm