video embed as mp 4 with animations are not synchronised will all browsers

I'm looking for a solution to synchronizate video embed as mp 4 with animations built on the slide layer for all browser.  Our Client are using Internet Explorer 8. When he starts the course, the Videos and the Animation are not synchronised. When he click on STOP, both are stopped...It seems a Java or a Flash Player Issue. Have you any similar issue ? Have you an idea to find a solution ? 

Regards

Emilie

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