Whats the best way to count frames on a video? I've been using ctrl+left/right on mpc but I've gotten my times wrong

Not a spyro answer, but this is how we do that in another community. We use an external software called Yua, which allows you to to frame advance by pressing the left/right arrow keys, and displays the current frame number on the lower left corner. You can find it googling "yua speeddemosarchive" It becomes ez to take 2 reference frames, and just do X - Y for timing loads