I've been trying to capture Dungeon Master footage using FRAPS, but it doesn't seem to exactly preserve all the original pixels, despite ticking the "Force lossless RGB capture". (It also seems to really slow down and the sound output becomes very poor and scratchy.)
EDIT: Regarding the scratchy quality: I fixed this -- it was a playback renderer issue in my media player. Setting it to use the old DirectDraw renderer plays it back with perfect pixels

Are there better tools that can do this accurately?
Also, what is the best way of encoding these videos so that they will look as crisp as possible on YouTube?