In that case I most likely didn't explain the theory behind the proposal well enough. On the vast majority of LD players, you're 100% correct - it absolutely isn't worth going through the effort of sampling off the pickup versus the output of the player itself. I agree.
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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.
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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Pretty much just find a capture device that can have its software/drivers modified to extend the region of the signal which is captured to include VBI data, manually merge captures to eliminate any bad regions of the disc, and call it a day.
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With LD, most of the VBI is synthesized by the player, and is devoid of any information. I can't remember which line # the recorded video starts and stops. Line 21 might be real.
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Doing a capture with a high-quality capture device is definitely a good idea, and would reveal which lines are "real" vs player-generated, because even if black, a "real" video line will show more noise than player-generated.
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