Actually it was just realtime in the game. I did also try doing one using film viewer but the colours were all weird on the captured video even though it looked fine in film viewer. Not sure yet what that's all about.
So yeah I just hit alt-f9 while I was flying then dragged the video into YouTube and voila.
The film viewer is not a stand alone app, it's actually part of the game. Basically just a window of the game reading recorded data.
Pretty sure the game is 8-bit.
32-bit full color could do that
32-bit floating point would not.
The color conversion could cause that.
MAYBE, check your Nvidia settings. I never really used it so kinda ignorant what settings they offer.
I only saw that when I used 32-bit full color in Bandicam to capture films.