Mobile and tablet video rendering fix

http://meta.discourse.org/t/chrome-for-ipad-iphone-breaks-with-this-video-embed/7983

#### Safari on iPhone:
<img src="https://f.cloud.github.com/assets/2722987/765507/1cf1141a-e82e-11e2-8b5e-599a7e64e300.jpg" width="50%" height="50%"></img>