使用HLS规范里的AES-128加密算法来加密TS文件，自动加密playlist里的所有TS，并每10个TS变换一次Key，支持IV,PKCS#7-support AES-128 to encrypt TS file, this tool support encrypt each TS in playlist automatically, and it will change key every 10 ts file, it alos support IV and PKCS#7