Horizontal Red and Green Lines (GV-USB2)

[fundo]

Hello there!

I have some trouble with my current setup for digitizing VHS family tapes. I'm located in Germany, the tapes are PAL. I'm using a Panasonic NV-HS830 directly connected to the capture card via S-Video. As far as I understand, this device doesn't feature any TBC functionality, but I'm not sure. How can I confirm?

For capturing, I have tried:

• EasyCap: Overall low quality, 4:2:0 subsampling
• Hauppauge USB-Live2: Good quality, audio clipping, settings are not persisted (probably a defective device?)
• I-O Data GV-USB2: Good quality

The GV-USB2 is the clear winner for me. Sadly, I am observing horizontal red and green stripes, but only when capturing with the GV-USB2. The stripes are barely noticable at original playback speed because the red and green parts are alternating. Interestingly, the occurrence and distribution of these stripes is the same when capturing the same scene repeatedly. But after a reboot of my PC and the VCR, the pattern changes. Sometimes, it is gone almost entirely. The capture settings are the same every time, and I haven't (yet) investigated whether it is the restart of the VCR or the PC or the capture device changing the pattern. I am capturing with VirtualDub2, but capturing with AmaRecTV gives the exact same result as long as I don't restart my setup.

I have attached two clips and frames of the same scene. Both are recorded with the same hardware and software setup, but a restart of my system has happened in between. The stripes are visible in capture_1 (and the respective frame), especially in the sky.

What could be the root cause for this behavior? Is it the lack of a TBC? Then why am I not seeing it with other capture devices? Or is my capture card defective? Any advice or hint is welcome!

Thank you in advance, and please let me know if I missed out on sharing some crucial info.

fundo