Why is the audio on my video getting out of sync when it is imported into itunes?

Hello,
I have videos in the MP4 Format, and have imported them into itunes. However, during playback in itunes, the audio gets more and more out of sync as the video plays. By the end of the film the audio can be 5-6 seconds out!
What's strange is that the source file, played with quicktime or Windows media player, is fine and works perfectly.
Why is the audio stretched once it is imported?
Thanks,
James

I have the same problem.
Motherboard: Gigabyte GA-MA785GPMT-UD2H
Chipset:
North Bridge: AMD 785G
South Bridge: AMD SB710
Video: Integrated ATI Radeon HD 4200
HDMI Audio through the HDMI port out to the TV.
Tried on Windows 7 Pro 32bit and Windows 8.1 Pro 64bit.
Tried with the integrated ALC889A audio device enabled and disabled (It seems that the video card drives the HDMI audio device though, because it still appears in Windows even if I disable the Audio device in BIOS).
Latest iTunes and drivers installed.
I have already tried all sugestions about matching Windows Audio settings to iTunes settings (bit depth, frequency rate).
Apple, any suggestions? I'm not having a great customer experience after buying a pair of HD movies in iTunes.

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