ITunes 10.5 video and audio getting out of sync

Hi,
my iTunes videos (bought from the store) are getting video and outio out of sync.
I found some hints to turn options in QT but iTunes 10.5 doesn't use QT - isnt'it?
Any ideas to solve this problem are welcome.
Yours Rüdiger

Hi and welcome to the forum!
First of all, don't convert the file to a MP4. What exactly are the specifications of the MPEG file you are using? It would help to know the frame size, frame rate, and the audio rate.
You most likely placed a 32kHz clip in a 48kHz sequence or vice versa.

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