I'd like to export my video to a .mov file which will be 16:9 aspect ratio. I've letterboxed my clip but when I export it, it has the two black bars, one at the top and one at the bottom. Now, what I want is a video with no bar but that will be 16:9. I tried to change the export setting to 720 x 405 to get a 16:9 image but it just modify the shape of the image and the black bars are still there.