Video capture problem

Yo. I’m trying to transfer some video from a mini dv tape to my pc via a camcorder. I’m close but the quality I’m getting is awful. I’m using the av out on the camera and I have an rca connector in the back of my pc. I’ve tested the camera and lead on a tv and the quality is great, but when I feed this in to my pc I start having trouble. Here’s what I mean:image

I’m using blaze media pro with these settings, although I have tried another capture software with the same results.

Any ideas what could be causing this? Thanks in advance.