У вашего броузера проблема в совместимости с HTML5
In part 3 of the iMovie Effects series we look at how to change the aspect ratio of your footage in iMovie by adjusting the export settings.
Camera: Canon 60D
Lenses: 10-20mm Sigma
Setting: 24FPS, 1/50", 320-640 ISO
Music: Soundtrack Pro
Editing: iMovie, Screenflow
Wallpaper: http://browse.deviantart.com/customization/?qh=§ion=&q=clouds#/d3iggna
Dock: http://macthemes.net/forum/viewtopic.php?id=16802835