加密ts文件解密

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#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:13
#EXT-X-KEY:METHOD=AES-128,URI="https://j-island.net/movie/hls_key/s/857401e309d8a032c3bb18f4b09b8db2/?f=jj_20190401_hihijets_004",IV=0xaa3dcf6a7acb92ff4fb08d9b3b3d6f51
#EXTINF:12.078733,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400000.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400001.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400002.ts
#EXTINF:12.012000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400003.ts
#EXTINF:9.009000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400004.ts
#EXTINF:2.002000,
https://j-island.stream2.johnnys-net.jp/j-island/jj_20190401_hihijets_004/jj_20190401_hihijets_00400005.ts
#EXT-X-ENDLIST

分析
m3u8视频另一种下载方式 如上图中用ts链接直接下载下来的ts视频文件是加密的（为什么要下加密的？虽然加密但是下载速度快啊）。
#EXT-X-KEY 字段已经写明了加密方式是AES-128，key通过URI获取，IV也有。

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#EXT-X-KEY:
METHOD=AES-128,
URI="https://j-island.net/movie/hls_key/s/857401e309d8a032c3bb18f4b09b8db2/?f=jj_20190401_hihijets_004",
IV=0xaa3dcf6a7acb92ff4fb08d9b3b3d6f51