I just encountered a strange thing in Vegas Pro 17 that's never happened before. In my video, a guy is wearing a red and black shirt. After I encode it using @wwaag's HOS, in the encoded file, his shirt is blue and black (along with all the other colors reversed). I thought it might have something to do with the fact that I converted a .mov file to an mp4 via some online converter site.
However, I also noticed that in my color gradient effect, the colors are also reversed. In the project, I choose a red gradient in the fx setup, and it looks blue in the preview window. But in the encoded file, the color gradient is correctly red.
What could be causing all this craziness with the colors?