第二层M3U8内容如下图：
解密方法参考帖子：https://www.52pojie.cn/thread-971265-1-1.html
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-KEY:METHOD=AES-128,URI="https://hls.videocc.net/aef3afd3d0/d/aef3afd3d0c8d7d6aa1145f4c0adb8dd_3.key",IV=0x7bfb150b3465f5abc5ec1b54f5524065
#EXT-X-TARGETDURATION:16
#EXTINF:12.523000,
https://ab-dts.videocc.net/aef3afd3d0/51/1567435616000/d/ad/b8/dd_3/aef3afd3d0c8d7d6aa1145f4c0adb8dd_3_0.ts?pid=1576549507523X1479524&device=desktop
#EXTINF:15.320000,
https://ab-dts.videocc.net/aef3afd3d0/51/1567435616000/d/ad/b8/dd_3/aef3afd3d0c8d7d6aa1145f4c0adb8dd_3_1.ts?pid=1576549507523X1479524&device=desktop
#EXTINF:7.840000,
https://ab-dts.videocc.net/aef3afd3d0/51/1567435616000/d/ad/b8/dd_3/aef3afd3d0c8d7d6aa1145f4c0adb8dd_3_2.ts?pid=1576549507523X1479524&
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