Problem syncing video capture with audio sountrack

Hi,
I'm a drummer. I'm trying to use iMovie to record a video of me drumming to a pre-recorded song. I want the final video to be me drumming with mixed audio of both my drumming and the original soundtrack. (Here's an example of someone else doing this on youtube: http://www.youtube.com/watch?v=cgqYkBFSva4)
I'm recording the video using iMovie's import from FaceTime (ie. straight from my MacBook Air) and then adding the song that I played along with as an additinal audio track from iTunes, and syncing.
This is where I hit a problem, and it's driving me nuts. When I sync the iTunes song into my iMovie project I use waveform view to line it up so start of the song is perfectly in sync with the start of the video of my drumming. That works fine. But then gradually over the course of the video the song track goes out of sync with the video/audio of me playing, and by the end of a 6 minute song there's a very noticable gap, which both looks and sounds terrible.
This is very strange since it's the same audio track I was playing along to! In real-time when recording I was obviously in sync with the music, but then when adding it back to the recording it somehow no longer lines up.
Does anybody know why this is happening and how I can resolve it? Is this a frame-rate issue?
It seems to me this shouldn't be so hard to do what I'm trying to do ...
Thanks!
Ari

Hey Ari,
I was having a similar problem perhaps and this is what I did to fix it.
timothymckean
Re: iMovie '11 audio sync issues since 9.01 patch
Jan 24, 2012 12:11 AM (in response to Urban Shocker)
Hi All,
I've been dealing with this sync problem tonight as well and here's what I found that worked.
I noticed that the audio sync was fine when I viewed in Quicktime 7, but not in iMovie. I also noticed there was a small indicator on the clips in iMovie notating that the source clips were in 17 fps, not 30 fps. This is odd because I recorded the clips using the FaceTime HD camera right into iMovie and it never gave me the option for framerate on the recording. Viewing the source video in Finder I also realized that the codec for the source was Photo Jpeg... yuck. Who's choice was that.
Using MPEG Streamclip (free video converter) I converted the source video clip to a Quicktime .mov at 30 fps and using the Apple Intermediate Codec and all the audio sync issues were fixed. Didn't have to optimize, detach, or - most importantly - re-edit anything. Apple's editing systems love Apple Intermediate Codec (AIC), I don't know why they don't import in this codec by default.
** Download MPEG Streamclip from http://www.squared5.com/

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