> The other option, introduce more and more analogue noise, and by the time you get to option 4 you would be lucky if one frame matched out of a thousand captures of the same disc, every capture would different from the last, so you always missing something.
This is something i dont understand. I assume that the VBI data is the most important that we need to have. If good broadcast equipment is used, i cant believe that there is so much "noise" introduced to the signal, that you dont have accurate VBI data. I am in no way a expert here, but this sounds very unbelievable to me. For the picture quality itself, it would be true, that every capture would look different, but not to a degree, that you would see that with just your eyes. As long as the VBI data is intact and there is for sure a tolerance to noise, it should be fine.