Video heavy

Hello, I installed this on a very video heavy website, the videos don't appear to be resizing or loading correctly all the time. Is there a way to tell the videos to resize or some other work around I can install?

If you use jQuery in the template, you can use this script: fitvidsjs.com/
If it isn't, css-only solution is explained here: alistapart.com/article/creating-intrinsic-ratios-for-video (but it is more complicated in some cases because of requires additional wrapping tags for videos).