Mp4 it is. That answers my question. Thanks. (sorry dumb question on the DW, I am actually pretty comfortable with it).
Now the tricky question is..... Have you ever seen a website where the header is actually a video, and a full-width video (that will re-size to the user's screen size?). I know I can detect a user's screen size, but just wanted to get your thoughts or suggestions (as you sound like you have worked with videos).
I wonder if there is any jQuery that you might know of that might help accomplish this? A full-width video header would be amazing, and some websites must have them. Any thoughts would be greatly appreciated! Thank you.