This is hilariously wrong and I would appreciate it if @aaronsgiles could give me an assist here considering as he was involved in dumping what LD games are currently supported by MAME.
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Correction, it's partially correct, but only partially. http://aarongiles.com/?p=238 More info than just the frame index is stored in the VBI region. And considering as the VBI region is an inherent part of the video signal, the video signal should be captured together with the disc.
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If you don't feel that it's worthwhile to try to capture laserdiscs with as high accuracy as possible, then you're more than entitled to your opinion. And I appreciate your help with the LCD games. But respectfully, if you want to tell me how to spend my time, get bent.
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Vastauksena käyttäjille @TheMogMiner ja @aaronsgiles
You can spend your time any way you like. If you don't want advice from someone who actually knows LD technology, fine, I'll not bother to offer any.
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Vastauksena käyttäjille @brouhaha ja @aaronsgiles
Your advice on LD technology thus far has amounted to "Don't bother to try to do better than the garbage MPEG encodes that people are passing around for use in Daphne". If that's the advice you intend to offer, by all means don't.
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Vastauksena käyttäjille @TheMogMiner ja @aaronsgiles
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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Vastauksena käyttäjille @brouhaha ja @aaronsgiles
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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However, I have heard rumors - unverified, but from people I'm inclined to believe - of players where the pickup *additionally* has a signal for whether or not it was successful in grabbing a given sample.
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The reason why this would be important for coming up with a theoretically perfect dump is that many discs these days have minor dropouts that would be quite difficult indeed to correct manually by merging together captures of multiple different examples of the same disc.
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In principle, knowing whether a single sample of the analog data was "good" or not would enable a sufficiently dedicated person to construct a capture with *zero* horizontal streaking or other artifacting due progressive rot.
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The idea isn't to capture with an overall frame quality better than what you'd get out of a capture card. It would be about being able to construct a capture that doesn't have minor, single-scanline or partial-scanline faults that are so prevalent. I hope that's more sensible.
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