I didn't say to not bother to try better. I offered my advice that sampling at the pickup is very unlikely to yield any improvement, and explained why. Obviously you're welcome to ignore my advice.
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The optical pickup can't magically tell whether a bit of oxidation of the aluminum or a scratch on the surface has made a pit look more like a land. It can only tell you if the laser is significantly out of focus, which only happens with severe laser rot, or broken player.
This is a really great point, and thank you for making it. It actually gives a technical reason for why it's unnecessary rather than resorting to "I know more about information theory than you", and it makes perfect sense. So, thank you.
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Having said that, it is possible to capture the VBI data since it's just a property of the video signal, simply one that most capture software cuts off before displaying it to the user. In fact, I believe the Cube Quest dump in MAME that Aaron did contains that data.
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It's just that it was captured with an ancient (by today's standards) capture card using hacked drivers that, I seem to recall, required Win 9x. Based on the information you're providing, it sounds like the ideal solution would be to find an equivalent method on a modern OS, yes?
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