I remember seeing a post somewhere around here discussing a program that would do this, but haven't been able to find it with multiple searches.
When backing up a DVD, I've noticed that the lower bitrate tends to give a bit of a "fuzziness" or noise in some scenes. It's not macroblocking, just generally "noise."
Is there some program you can use to go through the DVD-R and generally sharpen the picture and take away this digital noise? It seems like ffdshow can do things like this in real time for the playback, but I'm interested in permanently changing the source data on DVD backups so that they look better on playback in any standalone DVD player.