I'm currently doing this and running into trouble. Not going as smoothly as I hoped. I have captured 2 one-sided LDs without problems. I captured them twice and compared. They matched. Then I tried a 2 two-sided LDs and on each one, side one recorded fine, but side two on each had numerous samples which didn't match up. Mostly in the first 5-10 mins with a few later on. I cleaned the discs, but it made no difference. Both are concert LDs, one Japanese and the other USA.

My setup is:

Panasonic LX-600 optical output > optical to coaxial converter > Audiophile 2496 card in a G4 MDD running Tiger.