So I've resized all my YouTube thumbnails to 1280x720, which is a 16:9 aspect ratio like YouTube wants. When I embed them into a forum post, though, the sides are cut off. Also, there are black bars at the top and bottom while the video is playing, like watching a widescreen movie on an old 4:3 CRT television. Is this something that I have to fix via some obscure YouTube setting or is this something that needs to be looked at on the forum side of things?

Here's an example:

And now it's better? Weird.