One of the frequent issues seen with online video is formatting problems in aspect ratio and display resolution. You see a lot of these problems appear on YouTube with video just not looking right. In some cases, widescreen 16:9 video is squished into a standard definition or 4:3 aspect ratio.  Or you see 4:3 video stretched into a 16:9 aspect ratio. The standard practice of letterboxing transfers video shot in a widescreen aspect ratio to standard definition video format while preserving the film’s original aspect ratio. Pillarboxing (reversed letterboxing) adds vertical black  bars on each side of the video when the player a 16:9 aspect ratio. Windowboxing occurs when the video appears centered in the video player surrounded by a black frame on all four sides of the image.