https://blog.faceutil.com/2017/03/28/vobsub-dll-%eb%8b%a4%ec%9a%b4%eb%a1%9c%eb%93%9c-%eb%b0%9b%ec%9c%bc%ec%84%b8%ec%9a%94-virtualdub-%eb%b2%84%ec%b6%94%ec%96%bc%eb%8d%a5-%ed%95%84%ed%84%b0%ec%9e%90%eb%a7%89%ed%95%a9%ec%b9%98%ea%b8%b0/