When I trim a Video in QTpro, the video and audio become out of sync

I use mpstreamclip to export video to mov or mp4 files. When I load up on QT pro and then do some trimming, the resultant clips often have audio and video that are slightly out of sync.
Can anyone provide some guidance on what to do?
Thanks so much.
Skip

I think it is going to be a problem with the fps setting on export. If you entered 30 fps as the setting for export and you found the result had the audio getting further and further ahead of the video the longer you watched it may be that you needed to enter a frame rate of 29.97 fps to keep things in sync. I am doing similar tests on some conversions because I have had sync problems as well. I will repost when I check my current export at 29.97 fps.

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When I trim a Video in QTpro, the video and audio become out of sync

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