If you digitize a vinyl LP or an audio cassette 100 times, you will get 100 different sets of digital data, and no one of them, nor any composite you can make from them, are "correct". This is true for all analog recording systems.
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Possibly rather than using a device made specifically for capturing video, a general high-speed data acquisition (ADC) board could be used.
That's a pretty solid idea, as it would eliminate any possible sources of noise from a capture card trying to do any sort of weird post-processing or upscaling. And given an LD player of high enough quality, there shouldn't be much appreciable noise added to what's on the disc.
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The main issue is that such an interface probably can't do an adequate job for audio, so it will take some effort to time-sync'd the video from the ADC with the audio captured by e.g. a high quality "sound card".
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For LDs that encode digital data into the audio track, could this be an instance where tapping into the player's innards might actually make sense?
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