Lion Server HELP

I am using Lion Server to share videos that my students are making. Once we upload a video (created on a Mac or iPad) we cannot watch it on a computer using safari!!!! It only works on Chrome! Is there a plugin missing on safari??? We can view the videos on an iPad and iPhone.

We are using Lion Server - The browser is Safari 6.0 and the latest iVersion - The video has been been updated to an iPod/iPhone & iPad/Apple TV version along with a .mov. All version play using Chrome. No versions play using safari (tried multiple computers with Lion and Mountain Lion OSX).

Any ideas????