从HLS中删除字幕/字幕，并删除dash清单文件
我目前正在使用AWS MediaConvert将视频编码为HLS和DASH格式。我相信，在M3U8（用于HLS）和MPD（用于破折号）文件中，可以解析这些文件以删除所需的字幕。我希望解析M3U8和MPD文件，创建无需字幕的更新清单，然后将其保存回S3。以前有人做过类似的事情吗？
I am currently using aws mediaconvert to encode videos to hls and dash format. I believe that in the m3u8 (for hls) and mpd (for dash) file which is generated, these can be parsed to remove required subtitles. I am looking to parse the m3u8 and mpd file, create an updated manifest without required subtitles and save it back to s3. Has someone previously done something similar?
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这可以通过指定的S3桶中源表现出来触发的lambda函数来完成。 lambda脚本可以删除字幕线，并向不同的S3存储桶发布修改后的清单。然后，该脚本也应将细分段也复制到新的存储桶中，以维护可播放的HLS或DASH文件组。
另外，您可以将资产作为VOD资产摄入MediaPackage，并使用'？aws.manifestfilter = subtitle_language：xxx'过滤器时，要求使用VOD清单。 MediaPackage的此功能返回按需源清单的自定义（过滤）版本，而无需永久更改它。指定“ subtitle_language：zzz”的过滤器将返回一份清单，其中没有字幕。您也可以要求仅包括指定的字幕演绎。
This could be done with a Lambda Function triggered by the arrival of the source manifest in a specified S3 bucket. A Lambda script could remove the captions line(s) and post a revised manifest to the different S3 bucket. The script should then copy the segments over to the new bucket as well in order to maintain a playable HLS or DASH file group.
Alternatively you can ingest the asset as-is into MediaPackage as a VOD asset, and use the '?aws.manifestfilter=subtitle_language:xxx' filter when asking for the VOD manifest. This feature of MediaPackage returns a customized (filtered) version of the source manifest on demand without you having to permanently alter it. Specifying a filter of 'subtitle_language:zzz' will return a manifest with no subtitles in it. You could also ask for only specified subtitle renditions to be included.