FullScreen doesn't work in local application

Hello world,
I developed an application in Qt4.5 which is simply a very simple browser. It display HTML pages and so on.
In this pages, I have a flv object. This one is displaying well and I allowFullScreen. When I click on the fullscreen button, video goes on fullscreen but the pb is that sound continue, but the video freeze (if I leave the fullScreen mode, I'm in the right spot in the video playback)
If I launch the html file in Safari Browser, FullScreen works.
Thx in advance for any help

Nobody knows or has an idea about this strange issue?

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