Help me determine what artifact this is and how to fix this

[Nick Less]

Can anyone enlighten me as to what sort of artifact this is and how to fix it with avisynth? I'm capturing analog tv with Sapphire Theatrix 550, and even though i have reasonably good picture, i always get the picture that's, for lack of a better word, scratched. It's best noticeable on faces and other larger areas filled with same color. Is that noise or something else? I feel that it's probably due to the default filter settings in the card itself. How would i fix this? No matter how strong tjhe signal is, i still get this.

If necessary, i can provide a short clip.

http://img152.imageshack.us/img152/9445/badframe8od.jpg
http://img268.imageshack.us/img268/5775/badframe28qt.jpg

[krieger2005]

I don't know what you mean... The Picture is interlaced... or ist there something, what i don't see?

[Chainmax]

That sure does look like interlacing. I suggest you to read the Analogue Capture Guide on the Capture forum. It has loads of useful knowledge in it.

[Nick Less]

yes, there is interlacing, but there's something besides that.

i'll post a clip later, then you'll probably see it

[Mug Funky]

i think i know what you mean - the horizontal pattern that's _not_ interlace... it's got a period of about 5 lines?

you could try run defreq seperately on each field (probably with different settings...). there's also that other frequency killer that works only in one direction (i forget it's name, but it's not fanfilter), which you could use with turnleft() and turnright() to get it to go vertically.

no idea where it comes from though, sorry.

[mgh]

try
removedirt().turnleft().removedirt().turnright()
the type of noise is fairly common in analog capture when you have a technically challenged cable service provider-which is usually the case in my country:mad:
If you are encoding with x264, in addition use the denoiser at between 50 to 100. I have not recently tried denoisers coming with codecs such as divx and vp6. From what i recall, the one in divx was pretty useful at low strength
my version of remove dirt is 0.6.1