Overdubbed Music and Video Eventually Lose Sync

Hello Everybody,
I've encountered something and I just cant't seem to work out what's causing the issue.
I have just shot an exercise DVD with a fitness instructor.
Shot on my Sony Z5, HDV 108050i.
After the class the instructor gave me the exact CD she was using for her workout, so i could copy the songs and overdub them over the video I had just shot.
I am working in Final Cut Pro, in a HDV 1080i50 sequence.
I use a marker to sync the start of the song on the video I shot, then sync it perfectly with the same song that i'm dubbing over. The issue I have is that by around half way to 2/3 of the way through each routine, the songs have slipped off sync by a few frames (to be precise the video/audio on the video track is slightly behind the overdubbed music)
I'm confused how this can be as they are exactly the same song?
I appreciate i may be being an idiot here, but i'm completey perplexed!
Any advice would be greatly appreciated.
All the best,
Scott

You cannot expect a free-running CD player to maintain sync. When doing this kind of work, you need to have your audio playback on set locked to the video signal/timecode. Otherwise, the sync will, as you have discovered, drift.
One solution is to vary the speed on the audio clip to see if you can get the sync closer. Mark an In and Out on the camera audio where the song begins, and note the duration.
Now place your imported audio file from the CD to the timeline, and trim it so that the clip starts at the same place you marked In and on your camera audio. To get the sync at the outpoint to match, Control-click on your imported audio clip and select Change Speed . . . and when the Change Speed pane opens, set the duration to match the duration of your camera sound.
It might take a try or two to get it as close as possible.
MtD

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