Can’t get pass-through SCART cable to work.

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  • July 21, 2020 at 7:11 PM #39950
    rgbvcr
    Participant

    I’m interested in using OSSC to capture video from VCR (AIWA worldwide model), one issue is that I seem to have bought a pass-through SCART cable (from amazon). Looking at the internals all of the signals are simply passed from one connector to another, without any additional hardware (pull up / down resistors, caps, etc…).

    I can’t get anything but the black screen on the OSSC, when I first turn it on (prior to selecting input), I do see a black and white gradient test screen and I was able to use the capture hardware with different controllers.

    My biggest issue is that pin 16 of SCART is at 0V while both devices (OSSC & VCR) are working. I understand that it is an RGB selection signal and while at 0V tells the VCR to use composite video. I’ve verified that the is connectivity between pins 16 within the cable. My question: does OSSC properly output RGB voltage on this pin, or does the cable have to have a resistor to specify RGB output?

    July 21, 2020 at 7:23 PM #39951
    Zacabeb
    Participant

    The Aiwa VCR probably outputs only composite video, which the OSSC doesn’t decode (it only extracts sync from it). Some VCR/DVD combos might be able to output RGB from VHS, but even there it’s a rather specific feature.

    Pin 16 signals what the output device is sending, not the other way around.

    A solution (though costly) is to add a Koryuu, but it, the OSSC and receiving device might not be happy with the rather unstable signal most VCRs output.

    For capture, I think a dedicated composite video capture device is a better option.

    July 21, 2020 at 7:31 PM #39953
    rgbvcr
    Participant

    Thank you, I was jumping through hoops trying to get RGB out of the VCR, not realizing that it may not even support RGB šŸ™ I really appropriate your feedback, I guess what I got out of composite out is as good as it’ll get…

    July 22, 2020 at 12:27 AM #39957
    Zacabeb
    Participant

    You’re welcome. Sorry I was the bearer of bad news… šŸ™‚

    Yeah, composite video is fine for VHS. The limited bandwidth of the luma and chroma signals mean that when they’re recombined into composite video for output, they don’t really overlap enough to cause artifacts (aside from those that snuck into the recording). S-VHS is a different story, there you want to go with S-video.

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