M3U8 格式视频破解问题

我已经获取到下载地址，每个地址的 EXT-X-KEY 一栏有 URI 和 IV，不知道 IV 如何使用（格式如下），URI 对应的链接地址每次请求值都不同，第一次请求是 20 位，以后再请求都是 16 位的（一刷新就变，这一点很费解）。

哪位高手能给指点下，不胜感激！！！！

部分数据如下：

#EXT-X-KEY:METHOD=AES-128,URI="http://www.taiqischool.com/hls/4691/clef/7MBA448cdg9wkRR2fpuMral1orxb8TQr",IV=0x6e831511528c8da6661b90ac47cd8ea6 #EXTINF:15.080, http://ese3a5b8c0d58m-pub.pub.qiqiuyun.net/35805/a1e9236516ec48338cdb112a4687ffe8/lst1d-m6pvrxHyhn-shd_seg_0_ehls_bd9419?schoolId=35805&fileGlobalId=a1e9236516ec48338cdb112a4687ffe8&userId=15948&userName=ES1541936413 #EXT-X-KEY:METHOD=AES-128,URI="http://www.taiqischool.com/hls/4691/clef/7MBA448cdg9wkRR2fpuMral1orxb8TQr",IV=0x73ac5852b58a8153bfd448c97f96db03 #EXTINF:10.000, http://ese3a5b8c0d58m-pub.pub.qiqiuyun.net/35805/a1e9236516ec48338cdb112a4687ffe8/lst1d-m6pvrxHyhn-shd_seg_1_ehls_e59d14?schoolId=35805&fileGlobalId=a1e9236516ec48338cdb112a4687ffe8&userId=15948&userName=ES1541936413 #EXT-X-KEY:METHOD=AES-128,URI="http://www.taiqischool.com/hls/4691/clef/7MBA448cdg9wkRR2fpuMral1orxb8TQr",IV=0xf92147f6a99d8334535c625b7ce285f5 #EXTINF:10.000, http://ese3a5b8c0d58m-pub.pub.qiqiuyun.net/35805/a1e9236516ec48338cdb112a4687ffe8/lst1d-m6pvrxHyhn-shd_seg_2_ehls_9d6305?schoolId=35805&fileGlobalId=a1e9236516ec48338cdb112a4687ffe8&userId=15948&userName=ES1541936413 #EXT-X-KEY:METHOD=AES-128,URI="http://www.taiqischool.com/hls/4691/clef/7MBA448cdg9wkRR2fpuMral1orxb8TQr",IV=0xe59bb9942c2c34ee41bc09f985dd54fe #EXTINF:10.000, http://ese3a5b8c0d58m-pub.pub.qiqiuyun.net/35805/a1e9236516ec48338cdb112a4687ffe8/lst1d-m6pvrxHyhn-shd_seg_3_ehls_e40df9?schoolId=35805&fileGlobalId=a1e9236516ec48338cdb112a4687ffe8&userId=15948&userName=ES1541936413