HLS流：视频流中的多种音频替代方案

I have a problem with a certain HLS streaming setup. So far, my setup is that I'm using a video rendition of the stream which contains all the different audio alternatives as stream in the name .mp4. According to the specs, this should be possible by setting up my HLS master manifest like so:

我对某个HLS流设置有问题。到目前为止,我的设置是我正在使用流的视频再现,其中包含名称.mp4中的所有不同的音频替代品。根据规范,这可以通过如下设置我的HLS主清单来实现:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-ALLOW-CACHE:NO

#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",CODECS="mp4a.40.5",LANGUAGE="deu",NAME="Deutsch",DEFAULT=YES,AUTOSELECT=YES
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",CODECS="mp4a.40.5",LANGUAGE="spa",NAME="Español",DEFAULT=NO
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",CODECS="mp4a.40.5",LANGUAGE="eng",NAME="English",DEFAULT=NO

#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1391346,RESOLUTION=1022x574,CODECS="avc1.4d001f,mp4a.40.5",AUDIO="aac"
0009_orig/manifest.m3u8

However, testing this on an iPad, the video player offered me the different languages, but after choosing them, the player did not actually switch the language.

然而,在iPad上进行测试时,视频播放器为我提供了不同的语言,但在选择它们之后,播放器实际上并没有切换语言。

My guess is that the player is not able to actually find the corresponding track in the original stream. Is this even possible? Can I set this information in the manifest?

我的猜测是玩家无法在原始流中找到相应的曲目。这甚至可能吗?我可以在清单中设置此信息吗?

1 个解决方案

#1

UPDATE: The answer below applies to the version 3 of the protocol. The IETF draft you linked is for version 7. If the device supports version 7 you may be able to use a muxed media file although I haven't tried it yet. Use #EXT-X-VERSION:7 instead.

更新:以下答案适用于协议的版本3。您链接的IETF草案适用于版本7.如果设备支持版本7,您可以使用多路复用媒体文件,但我还没有尝试过。使用#EXT-X-VERSION:7代替。

According to developer.apple.com:

根据developer.apple.com的说法:

Alternate Audio and Video Renditions

备用音频和视频再现

The audio tracks contain unmuxed (signals have not been combined) audio segments. The master playlist file controls the playback.

音轨包含未复用(信号尚未组合)的音频段。主播放列表文件控制播放。

I take it this means you have to provide the URI for a single audio stream:

我认为这意味着您必须为单个音频流提供URI:

#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="aac",NAME="Deutsch", \
      DEFAULT=NO,AUTOSELECT=YES,LANGUAGE="de", \
      URI="main/german-audio.m3u8"

#1