@샤나，Thank you for your good software!
In video coding, sometimes it is necessary to modify the size of the picture, such as: the old 4:3 movie is changed to 16:9, the current operation of the software needs to calculate the width and height of the new picture, which is slightly inconvenient. If you can choose the ratio (e.g. 16:9) and lock it, you only need to input (or select) any value of the height or width, and fill it in automatically. It is much more convenient to recharge another value. Is it feasible?