Video playback on pc out of sync with audio

hello, play back on iPhone all ok but when I play it on my pc the video lags and the audio is out of sync.
heres the strange part. If i create a project with the video using iMovie and do not edit it at all and save it as 1080hd, that video plays on pc all ok

Q? Are you using Quicktime to play the video on your PC or other video player like Real Player?
As some 3rd party players may not sinc right or you may have to download a newer codec.
I use GOM player and it works well on my PC for video from iPhone 4S.
Hope this helps.
Greg

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