what the heck are these lines from??

[DaveQB]

not sure if this should go in newbies or here, so here it is (i am sure it will be moved otherwise)

with my new CX23881 chip based card i can get some good quality, but....

i found toinight running some tests the best res is 320x240
384x288 is a better quality, but i get these damn lines, like a "digital" look to it.

@ 640x480, its all over the place,
of course 240x180 removes these lines completely, but the quality is, of course, getting closer to the old 8-bit chipped based cards

http://DavidWard.myvnc.com/lines.jpg

what could this be and any filters for VD that could solve it??
i capture with iuVCR, as the software that came with sux and theres limited programs that suport this new chipset

thanx