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>The game outputs at 30 fps and on faster songs, it would miss nearly 30% of notes.

That 30fps is interlaced though, so there is 60Hz motion. All of the PS2 GH/RB games I know run at 60fps internally.

I don't understand exactly what you mean. There were only 30 frames coming in per second that I could parse. Do you think there might be a way to get 60fps from the PS2 and parse that in the OpenCV code?

What's your video setup? A look around says Guitar Hero 2 will do 480p with component cables. I'd assume it puts out a new frame each time, but it could be 480p with doubled frames.

Yeah that's probably the easiest and most latency-free way. It's absolutely 60fps of unique frames, especially with GH2. GH1 can also be hacked for 480p, even though the option isn't present in the normal game.

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