Video & Audio synchronization (SOLVED)

Hello guys,
when i edit a gameplay a have this problem on every video. The video itself doesn't have any problem with the synchronization video and audio but when i import it on hitfilm and i put it to edit the video isn't synchronized anymore.
if i try to unlink the audio and drag it a little bit right in the timeline to synchronize it with the video after a while it brakes again..
What do you think it's the problem ?
Thank you !
Comments
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The issue is that your footage uses variable frame rate, and it is addressed in detail in the sticky thread that discusses editing game footage, here: http://hitfilm.com/forum/discussion/40639/how-to-work-with-edit-video-game-footage-in-hitfilm#latest
Basically, you want to convert your videos to a constant frame rate before you edit them.
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AxelWilkinson
the video of the gameplay is ok before hitfilm. When i put the video in hitfilm then something goes bad and the video lose the synchronization -
@Eddie5 AxelWilkinson's answer is right. Your video was recorded with a variable frame rate which will play back ok most of the time but it won't work in any serious editor. Non-linear editors are frame accurate and demand constant frame rate clips. The thread AxelWilkinson linked to has tutorials on how to fix your problem.
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@AxelWilkinson and @Aladdin4d are right, and Handbrake is most definitely the easiest way to solve the problem. I had the same issue, and Handbrake was the solution!
Read the rest of the thread that Axel linked above to get the exact Handbrake settings that you will want for the best possible video you can make. Good luck @Eddie5!