I'd recommend changing src attribute from http://www.youtube.com/embed/something to //www.youtube.com/embed/something in order to eliminate issues with videos loading in https:// pages.
Ah, yeah, I would, but that causes problems in webviews in apps when YouTube content traverses from web to app. Damned if do, Damned if you don't. I'm leaving this as an exercise for the reader.
I'd recommend changing src attribute from http://www.youtube.com/embed/something to //www.youtube.com/embed/something in order to eliminate issues with videos loading in https:// pages.