I understand to maintain the correct aspect ratio various non 16x9 videos cannot fill the screen. But, it should be able to fill the screen with either the length of the width. Why do I get videos that are in boxes in the middle of the screen with spaces on all sides? If it's too wide to fill the height it should fill the screen from left to right -- conversely, if it's too tall to fill the width it should fill the screen from top to bottom. What's the deal?