I'm just wondering about something. When I post on youtube, the video is both pillarboxed and letterboxed. I thought there was some problem, but then I looked at some other films and many are like this, although not all seem to be. I edit in 16:9 in CS3, and it fills the program monitor window as it should. When I put it on a DVD it plays as 16:9 as I expect. I export to media encoder using H264 format, youtube preset. I've tried a couple of others, but they seem to result in the same outcome. Is this just how youtube looks, or is there a way to get it to use all the screen real estate that seems like it should be theoretically available? Or is there just a better preset in general that anyone would recommend? Here's my latest example.

Many thanks.