Video Different Length Than Audio

Hi
I created a reference file in FCP and encoded through compressor. For some reason, the video length is a few frames longer than the audio. This is confusing my timeline in DVDSP.
Does anyone know what I'm doing wrong?
Thanks

I am shooting and capturing in DV-CAM, editing in Final Cut 5, and exporting using Compressor for DVD. I'm not doing any sample rate conversions or changes in frame rate.
The interesting thing was, after I investigated further, on some of the clips, Final Cut and DVD Studio Pro saw the compressed MPEG-2 video as being different lengths. Also, even though the audio and video showed as being up to 1 second different in length in DSP (on a 24-min. clip), when I put both on a timeline, they reconciled within a frame. There must be some kind of imbedded time code that is keeping them in sync.

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