I'm working on a video that I'd like to letterbox to 2.20:1 proportions. So, I created a title-card mask with two black rectangles at the top and bottom of the screen, to mask the image to widescreen.
The problem is, when I export the video (to Youtube HD settings), the top, bottom, and sides of the final include a pixel-wide line of the images _below_ the mask. This happens even though the black rectangles extend well beyond the edges of the screen.
I hope I've described this well enough. Any suggestions?