Why are my imovie video and garageband track out of sync?

Hi
I'm currently making a video of an original song for youtube. I've been recording the video in imovie and the audio in garageband. I mixed down the audio in garageband and imported it to imovie. I lined up the audio with the visual at the start of the track, only to find it gradually goes out of sync with the video. I tried a different approach, syncing up the video and audio at the end of the song. I went back to the start of the song to see how in sync it was and the audio started way before I open my mouth! Unfortunately imovie did not record any sound, so I can't use the imovie sound to sync it.
I have literally no idea how the video and audio could be going out of time! I have one video and one audio track, so it's not a mix up.
It is totally bizarre and I wonder if anyone could suggest what's caused it/how to solve it.
Thanks
Vic

First do not use the Share ➙ iDVD menu option in iMovie. Use the Share ➙ Media Browser. The former loses considerable quality in the shared movie. Drag the movie from the Media/Movies pane in iDVD into the iDVD menu window.
Follow this workflow to help ensure the best quality video DVD:
Once you have the project as you want it save it as a disk image via the File ➙ Save as Disk Image menu option. This will separate the encoding process from the burn process.
To check the encoding mount the disk image and launch DVD Player and play it. If it plays OK with DVD Player the encoding was good.
Then burn to disk with Disk Utility or Toast at the slowest speed available (2x-4x) to assure the best burn quality. Always use top quality media: Verbatim, Maxell or Taiyo Yuden DVD-R are the most recommended in these forums.
Did the footage come from a video camera? If so see Bengt Wärleby's post in this topic: video and audio out of sync when...: Apple Support Communities
OT

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I've seen this issue, but it's not so critical for me. It doesn't happen 100% of the time or in most situations it's very hard to see.
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