https://blog.wongcw.com/2019/10/17/screentogif-v2-19-2portable-%e5%a4%9a%e8%aa%9e%e8%a8%80%e4%b8%ad%e6%96%87%e2%80%8b%e2%80%8b%e7%89%88-gif%e9%8c%84%e8%a3%bd%e5%b7%a5%e5%85%b7/