How can I compare two midi files in % of sameness?

I have an ideal MIDI file and recordings of real performances of the same score. I need to evaluate, how much succesful real players were. I am looking for a tool like "diff".

Answer 1

[Image Analyst]

Do you mean like

mse = immse(midi1, midi2);
percentSame = 100 * sum(midi1 == midi2) / numel(midi1);

?

[Jan Lechner]

Something like that, but Ideal (midi1) is computer-produced and Real (midi2) is recorded real performance. So they don't have the same size.

I need a tool that measures playing accuracy as the Android App "Perfect Piano" does.

And it doesn't have to be done on MIDI files - I can use *.ogg or *.wav files instead.

[Image Analyst]

You might have to do some cropping and scaling along both the x and y axes so they can be compared.