Set the aspect-ratio of videos

Thanks a lot for the new feature wher it's now possible to set the height of the video in pixels. It's already a big improvement. But I was wondering as an improvement if it'd be possible to actually either set the aspect ratio of the video additionally to the pixel height, or just recognized the aspect-ratio automatically and display it in the right one and then only have a setting for the size of the video instead of pixel height. The idea being to avoid the black bars appearing on different devices. (But the initial fix already addresses the bigger part of the problem)