Arnie.d said:

OK, I received my new voltage convertor and did an average test of 3. I must say it does help to reduce the chroma noise. But since I capture in RGB the ,25,2 addition to the temperalsoften doesn't work and I don't want to convert to yuy2 or something like that, I want to keep it RGB.

Or I could just abandon the RGB stuff and capture in yuy2.

About the capture card settings, wouldn't it be best to just set them to the defaults and manually adjust brightness and saturation later using avisynth?

I did a couple of tests and the scenechange parameter isn't going to be of any real use, I worked out two very noisey frames are up to about 5% different, but even a badly corrupted frame isn't much more different on average(I added in ~4000 white pixels and this only made it 6% different). So I would ignore the scenechange parameter and stick with capturing in RGB.

If you were iterested comparing the average of 5 captures you can use either of these scripts:

interleave(source1,source2,source3,source4,source5)
temporalsoften(2,255,255)
selectevery(5,2)

or:

merge(merge(merge(source1,source2),merge(source3,source4)),source5,0.2)

as for the capture card settings, I'm not an expert so I'll let someone else answer that.