S-Video or capture card problem?

[MichalisRG]

Hello. I notice something strange in the preview on virtualdub and other programs. Here is a screenshot to see what i mean. The preview is streched in virtualdub so the dots in picture are more visible...
It only happens when the connection is S-Video and not when it is Composite.
The VCR is JVC-9600 and the capture card is diamond VC500. Has anyone seen the same problem again and how can i possibly solve it?
Thanks in advance

[KhAoS182]

JVC VCR have this problem in the menu called dot crawl, then in the capture they should disappear.

[MichalisRG]

Ok so there isn't really a problem here.
Thank you!

[lordsmurf]

Menu screens are generated video,. not actual video, and can contain errors not seen in the actual video. The menus can be useful as tests patterns, but also not useful as test patterns. You really have to know the quaities of your deck, and how it interacts with TBCs and capture cards in your specific workflow.

PAL JVCs are more prone to errors than NTSC, and it's probably because the menus were designed NTSC, then ported to PAL. That's always been my theory. In general, PAL test patterns seem degraded more than not. I'm not referring to external patterns (which are often fine), but embedded patterns in devices.

VirtualDub is stretched beyond 5:4 (the 720x576 SAR) either because
(1) wrong capture resolution,
(2) an issues the graphics card.

The VC500 has issues, and is likely contributing to the crawl here.

[hodgey]

I don't think it's anything to do with NTSC vs PAL. The reason you are seeing the dot pattern is because if you look at the schematics they didn't bother to wire up full separate S-Video output from the OSD chip, just composite, even on the SVHS decks so I think they just put out the composite signal on both y and c outputs when showing the OSD with background.

[MichalisRG]

Thank you all for your responses. I stopped using the VC500. I have now a pinnacle 710 and a Ati AIW 9000 so i think now the results will be better...

[lordsmurf]

Quote:

Originally Posted by hodgey

I don't think it's anything to do with NTSC vs PAL.

I agree, no it's not.

The difference between PAL and NTSC here is due to how the decks are made, likely with an NTSC native menu system being ported to PAL. Not a difference between PAL and NTSC inherently. Very brand specific, and deck line specific.

And I do think it's composited output over s-video, at least for the PAL units. I know it differs per deck for NTSC units.