VHS Chroma Problems

Faulty · 21st January 2014, 07:47

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 · 25th September 2014, 22:31

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

Mick · 26th September 2014, 20:55

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 · 8th February 2015, 16:31

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 · 21st April 2015, 17:30

Hi scharfis_brain!

When You make upscale before or after QTGMC?

yup.

Emulgator · 22nd April 2015, 13:47

In case scharfi won't see: after.

8th February 2015, 16:31	#4 \| Link
scharfis_brain brainless Join Date: Mar 2003 Location: Germany Posts: 3,655	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 ;-) __________________ Don't forget the 'c'! Don't PM me for technical support, please.

22nd April 2015, 13:47	#6 \| Link
Emulgator Big Bit Savings Now ! Join Date: Feb 2007 Location: close to the wall Posts: 2,029	In case scharfi won't see: after. __________________ "To bypass shortcuts and find suffering...is called QUALity" (Die toten Augen von Friedrichshain) "Data reduction ? Yep, Sir. We're that issue working on. Synce invntoin uf lingöage..."

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25th September 2014, 22:31	#2 \| Link
Filker Registered User Join Date: Dec 2008 Posts: 39	That's very common in VHS. Try filtering with CNR2. http://avisynth.org.ru/docs/english/...lters/cnr2.htm

26th September 2014, 20:55	#3 \| Link
Mick Registered User Join Date: Nov 2013 Location: France Posts: 61	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

21st April 2015, 17:30	#5 \| Link
yup Registered User Join Date: Feb 2003 Location: Russia, Moscow Posts: 854	Hi scharfis_brain! When You make upscale before or after QTGMC? yup.