https://blog.faceutil.com/2017/03/21/autobpm-%ed%98%84%ec%9e%ac-%eb%93%a4%eb%a6%ac%eb%8a%94-%ec%9d%8c%ec%95%85%ec%9d%98-%ed%85%9c%ed%8f%ac%eb%a5%bc-%ec%9e%90%eb%8f%99%ec%9c%bc%eb%a1%9c-%eb%b6%84%ec%84%9d%ed%95%98%eb%8a%94-%ed%94%84/