Video duration increase on m2v encode

Recently, I noticed the durations of my m2v and aC3 files are not encoding with exactly the same in duration (encoded with Compressor 2.0.1 from the same self-contained 29.97 file). For instance, the source file duration is 02:47:19. Upon encode and import into DVDSP 4.0.3, the duration of the ac3 has remained the same as the source, while the duration of the m2v has increased to 02:47:23. If I import the source file directly into DVDSP, the duration of both video and audio tracks shows as 02:47:19. The disparity increases on longer clips, which makes me suspect a drop-frame issue, but how, I'm not sure.
My questions are: How is this happening? When placed in the timeline, is the ac3 audio track being stretched to fit the longer video duration? On longer programs will audio eventually drift out of sync? And of course, how can I make the 2 tracks encode with the same duration?
Any input is greatly appreciated. Many thanks in advance.
ryan
Dual 2.7 G5 Mac OS X (10.4.6) 2GB RAM
Dual 2.7 G5 Mac OS X (10.4.6)

Thanks. That was quick! I just found a reference to Sony Bravio Flatscreen TVs and the Cinemotion setting and I turned it off and everything is great! I've worked DAYS on this converting a single file 30 different ways.
Thanks for your help.

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