I have embeded a video into a slide on powerpoint. I set the poster frame as a picture in from a file on my computer, unrelated to the video. This picture is a portrait shape, while the video frames are landscape, and when I set the poster frame as "fit" (so that the portrait fits in a landscape video frame), it sets all of the frames in the video as portraits, making it look very awkward with a lot of black on either side. HEEELPPP!!!