> That said, from having read through the MAMEtesters bug that you linked to, I'm not > sure what that would have to do with lossless storage in a CHD. The bug makes it > sound as though the real issue was that the video and audio were captured from a > damaged disc, and that damage would render the game unplayable past a certain point.
It's not about the lossless storage, but the capturing of frames from the Laserdisc player. What it has been discussed here is exactly the same method currently MAME uses to get Laserdisc information, this time with less scanlines captured (only 3 of choice). If you read further into the report you'll notice someone partially fixed the problem by separating audio from the CHD and hand editing the audio before reintegrating it back. So the problem was not exactly a scratched disc at all, but how the information was gotten.