I’ve checked it in chrome, safari, and firefox. All present the problem. I’m on a mac if that makes a difference… OSX 10.9.2
It’s not about it resizing with the browser, but about it loading initially with letterbox bars when the browser is scaled down. If I load the browser at full screen scale, the embedded video loads correctly and once it loads correctly, it scales properly with the browser. But if the page loads when the browser isn’t scaled to the full screen, it loads with letterbox bars and then when I resize the browser after, these letterbox bars stay.
I’ve attached two pictures of what it should look like and what it does look like.