https://blog.wongcw.com/2020/06/15/facebook-transcoder-ai%e5%8f%af%e5%9c%a8java%e3%80%81python-%e5%92%8cc-%e4%b9%8b%e9%96%93%e8%bd%89%e6%8f%9b%e4%bb%a3%e7%a2%bc/