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Also capture the audio sample from the same record alongside the video. Repeat with lots of records. Train a model to predict the audio from the video. Voila! Play records with just the camera “stylus”...

I once thought about building this, but it's much harder than you think.

The data has to be processed very quickly. I believe you should think in terms of 0.3m groove per second.

If you put a camera above the groove you also need something like a stepper motor to control the arm.

But I believe the biggest problem is dust. A needle will move small particles out of the way, but a camera does not.

This is also why laser turntables need 'clipping' filters. Dust will create all kinds of noise you don't want to hear.

>The data has to be processed very quickly.

How about designing an arm that used more than one laser 'needle'?

This would be a cool project