VHS Chroma Problems

[Faulty]

Hi,
I’ve only recently tried my hand at capturing and restoring some VHS material. I used this forum at lot and my first attempt provided rather good results. However I am having trouble with a particular tape which I believe is rainbowing or colour banding. I’ve taken a screen grab of it below however it can be seen through the whole 50mins tape and is most obvious on whites (particularly when deinterlaced).

I haven’t been able to get rid of it using any filters and was wondering if anyone had any idea what was causing it and how I might be able to fix. I’ve tried different VCRs and Capture Cards but with the same result, however I haven’t been able to track done a VCR with an S-Video output. Before I go and buy VCR with S-Video output I was hoping people may be able to give some advice as to the direction I should go.

Cheers.

[Filker]

That's very common in VHS.
Try filtering with CNR2.
http://avisynth.org.ru/docs/english/externalfilters/cnr2.htm

[Mick]

Hi Faulty,
this also happens with bad Quality Cables and i mean the "Thin ones" that are included with most DVD/BluRay Players and VCR's. I solved this Problem with a 75 Ohm Shielded Cable using the Composite Output and a good Shielded S-Video Cable from my VCR's. Another Solution could be a little Mixer with S-Video Output that transforms Composite to S-Video, worked fine from my Experience.

But to help you further, what System do you use (Windows) and what Device for Capturing you Videos (USB, PCMIA, Addon Card) plus what Codecs do you use ? VirtualDub Capture ? If yes, which Version ?

Good and reliable VCR's with S-Video are the ones from Panasonic NV Series, JVC and Sony. You could get them cheap over the Internet and might want to try that too. Say, how many Tapes do you plan to Capture ? Have you tried the Capture Filter Settings for correcting the Hue and Saturation ?

Cheers
Mick

[scharfis_brain]

I'd just filter it heavily with QTGMC, a wide temporal radius, and high denoising settings.
Since I'd always deinterlace to 50p or 59.94p and encode as 720p today.

This should get rid of most rainbowing artifacts ;-)

[yup]

Hi scharfis_brain!

When You make upscale before or after QTGMC?

yup.

[Emulgator]

In case scharfi won't see: after.