I'm not really sure it was right on the beat, with such a fast rate, your mind will close the gap.
But yes, cutting manually is the other way to do it.
Tedious is the name of the game for most videos worth their view count. And I'm not sure I would call that tedious, try rotoscoping for a 2D to 3D movie...
Vince Becquiot
Kaptis Studios
San Francisco - Bay Area