charleston style, proper sync

how i made this video:    • how i made the "charleston style, pro...  

similar to the original charleston dance video dubbed with daft punk's "around the world", except al and leon are dancing in sync with the beat.

original videos from here:    • Charleston -- Original Al & Leon Style!!  
and
   • charleston style  

i'm not sure what the meter is for the charleston dance.. i just assumed it's 4:4. not that i had a choice, since i was using "around the world". but i think this is the cause of a couple inconsistencies that i haven't fully figured out yet (or maybe i just can't count correctly). for example:

1. when the second guy comes out to dance, he starts on the 9th bar of the original song. so i made sure the 9th bar of "around the world" began when his dance began. but nine bars earlier in "around the world" does not correspond with nine bars earlier in the original song.. that's why the video starts out silent for a couple beats.
2. when the first guy comes back, his knees come together on the 4th beat in the original song.. but with "around the world", they come together on the first beat.
3. not all parts seem 100% synced. but watch to the end and you'll see that it is, in fact, synced overall.

figured out the timing of their dancing.. reconciled the difference between it and "around the world" by pitch shifting the song to match it, then dubbing it with the video and doing an assumefps() to a faster speed and resampling the audio afterwards.