看起来ios不喜欢将加密的.ts文件与EXT-X-DISCNTINUITY标记混合在一起的hls m3u8文件。
这是一个测试播放列表，它是两个视频的混合。未加密的预滚动广告和主加密视频。两者在分开的情况下都打得很好，但当我把它们放在一个单独的m3u8中，用EXT-X-DISCONTINITY分隔时，只播放预滚，然后玩家停止。
#EXTM3U
#EXT-X-TARGETDURATION:10
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/vig_400-0.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/vig_400-1.ts
#EXT-X-DISCONTINUITY
#EXTINF:10,
#EXT-X-KEY:METHOD=AES-128,URI="http://ixemes-ppweb.ixemes.com/prerollmain/113760.key"
http://ixemes-ppweb.ixemes.com/prerollmain/02-0.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-1.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-2.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-3.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-4.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-5.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-6.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-7.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-8.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-9.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-10.ts
#EXTINF:10,
http://ixemes-ppweb.ixemes.com/prerollmain/02-11.ts
#EXTINF:2,
http://ixemes-ppweb.ixemes.com/prerollmain/02-12.ts
#EXT-X-ENDLIST
我试过两个未加密的视频，它有效。我在HLS规范中没有看到任何内容表明禁止在加密视频中使用EXT-X-DISCNTINUITY标签：https://datatracker.ietf.org/doc/html/draft-pantos-http-live-streaming-08#section-6.3.3
所以我想这是苹果公司自己的规格实现的错误，但也许是我做错了。
我制作了一个快速的html页面来测试它（在任何ios5设备上的safari中打开它）：http://ixemes-ppweb.ixemes.com/prerollmain/index.html
我注意到您的EXT-X-KEY没有IV项，也就是初始化向量。这得到了标准的支持，例如：
#EXT-X-KEY:METHOD=AES-128,URI="https://priv.example.com/key.php?r=52",IV=0x9c7db8778570d05c3177c349fd9236aa
如果这是缺失的，以下是如何https://developer.apple.com/library/ios/technotes/tn2288/_index.html说玩家应该选择IV:
媒体加密的默认初始化矢量（如果没有指定）是媒体文件的序列号。你应该指定初始化矢量值，而不依赖于序列数字。其主要原因是可移植性。例如，如果更改片段在播放列表中的显示位置（例如，插入ad），更改其序列号，需要重新加密。
在我的团队中，我们很难弄清楚为什么插入广告的加密内容没有播放。我们有一个播放加密内容的例子：
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:11
#EXT-X-KEY:METHOD=AES-128,URI="http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans.key"
#EXTINF:11,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-1.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-2.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-3.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-4.ts
#EXTINF:10,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-5.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-6.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-7.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-8.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-9.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-10.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-11.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-12.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-13.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-14.ts
#EXTINF:5,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-15.ts
#EXT-X-ENDLIST
你可以在尝试http://demo.theplatform.com/dev/m3u8/encrypted.m3u8.但当我们在它之前插入内容时，就像这样，它没有播放：
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:11
#EXT-X-KEY:METHOD=NONE
#EXTINF:10.01,
http://ne.edgecastcdn.net/0008B0/mps/Inkola_VMS/20/687/15_WordIsOut_UPFW1764H_1080p_20802040_m3u8_video_480x0_400000_primary_audio_eng_2_x5e1c9dd7b9834f38a319d348e1a5f9ee_00001.ts
#EXTINF:5.088,
http://ne.edgecastcdn.net/0008B0/mps/Inkola_VMS/20/687/15_WordIsOut_UPFW1764H_1080p_20802040_m3u8_video_480x0_400000_primary_audio_eng_2_x5e1c9dd7b9834f38a319d348e1a5f9ee_00002.ts
#EXT-X-DISCONTINUITY
#EXT-X-KEY:METHOD=AES-128,URI="http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans.key"
#EXTINF:11,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-1.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-2.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-3.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-4.ts
#EXTINF:10,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-5.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-6.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-7.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-8.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-9.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-10.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-11.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-12.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-13.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-14.ts
#EXTINF:5,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-15.ts
#EXT-X-ENDLIST
此URL是http://demo.theplatform.com/dev/m3u8/mix.m3u8.我们发现，问题是因为我们添加了两个片段，媒体序列号现在减少了2。如果您明确地将IV设置为"0x000000000000000000000001"，如下所示：
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:11
#EXT-X-KEY:METHOD=NONE
#EXTINF:10.01,
http://ne.edgecastcdn.net/0008B0/mps/Inkola_VMS/20/687/15_WordIsOut_UPFW1764H_1080p_20802040_m3u8_video_480x0_400000_primary_audio_eng_2_x5e1c9dd7b9834f38a319d348e1a5f9ee_00001.ts
#EXTINF:5.088,
http://ne.edgecastcdn.net/0008B0/mps/Inkola_VMS/20/687/15_WordIsOut_UPFW1764H_1080p_20802040_m3u8_video_480x0_400000_primary_audio_eng_2_x5e1c9dd7b9834f38a319d348e1a5f9ee_00002.ts
#EXT-X-DISCONTINUITY
#EXT-X-KEY:METHOD=AES-128,URI="http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans.key",IV=0x00000000000000000000000000000001
#EXTINF:11,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-1.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-2.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-3.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-4.ts
#EXTINF:10,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-5.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-6.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-7.ts
#EXTINF:7,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-8.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-9.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-10.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-11.ts
#EXTINF:8,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-12.ts
#EXTINF:6,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-13.ts
#EXTINF:9,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-14.ts
#EXTINF:5,
http://playertest.longtailvideo.com/adaptive/oceans_aes/oceans_aes-audio=65000-video=2042000-15.ts
#EXT-X-ENDLIST
然后它就起作用了。你可以试试这个http://demo.theplatform.com/dev/m3u8/mix_fixed.m3u8.所以也许这就是你遇到的问题。
好的，看起来它与主视频的加密无关，而是与主视频如何编码有关。我无法控制主视频的编码方式。我只是出于测试的目的对预录视频进行了编码（并chuncked）。
如果我将预卷与相同的主视频混合但未加密，它也不起作用。如果我混合了两个由同一个外部编码器编码的视频，无论是否加密，都不起作用。不知道外部编码器的编码参数出了什么问题，但不连续标签不起作用。
但是，如果我对自己的视频（预滚动和主视频）进行编码，对主视频进行加密，并使用间断标记将它们放在一个单独的m3u8文件中，它就可以工作了。
因此，ios处理不连续标记的方式仍然存在问题，并且没有完全重置播放器参数，但至少可以在加密视频之前插入未加密的预播放视频。