This sample is from the game Jedi Knight 2, It shows the last problem in the native roq decoder. The problem is that on scenes with mean_motion!=0 (whole frame move) chrominance blocks are not copied correctly. the result is e.g. that blue sky infiltrate in the red rocks. I believe that calculation of U and V plane addresses don't use right formula, or rounding. I had tried to guess it but no luck. The error is really small, and not very noticeable.