Loss of a/v sync upon convert to h.264 .mp4 file

Hey guys
This file is about 1hr:20min long- It's an interview shoot that I needed to send raw footage of for review by a friend, anyways when I export the .mp4 file it comes out out of sync
My source footage in pr Pro CS4 is HDV and everything is perfectly in sync when played from the timeline
(in timeline source footage is 1440x1080 HDV 48 khz and export is to 640x360 widescreen h.264 22.4 khz)
but when I export it and play back with Adobe Media player the .mp4 file slightly goes out of sync and after about 10- 15 minutes it's noticeable- by the 1 hour mark it's even worse
I always close down Pr Pro CS4 first, then open up AME CS4 to encode the video by importing the sequence
Has anyone ever had to deal with this issue
any solutions??
Thanks
Tony

Looks like I answered another one of my own questions
It seems that changing the export audio sample rate from 22khz to 24khz did the trick- I guess this should've been obvious being that the original audio is
48 khz and 24 being exactly half of that
A friend told me it could've been a drop frame issue (meaning maybe HDV and my export options drop frame didn't match maybe one was non drop frame and the other was drop frame)- something to keep in mind going forward, but was not the issue here.
Anyways
Hopefully info this will help someone in the future
Best
Tony

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