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This change introduces support for signaling CEA-608 and CEA-708 closed captions in DASH. (Equivalent of https://github.com/shaka-project/shaka-packager/pull/1532) It reuses the existing --closed_captions command-line flag. Note that some options (name, autoselect, and default) are not used for DASH. ``` --closed_captions 'channel=CC1,lang=fra;channel=CC2,lang=eng;channel=SERVICE1,lang=eng' ``` For Dash this adds an Accessibility tag in each video AdaptationSet. Example output : ``` <AdaptationSet id="1" contentType="video" ....> <Accessibility schemeIdUri="urn:scte:dash:cc:cea-608:2015" value="CC1=fra"/> <Accessibility schemeIdUri="urn:scte:dash:cc:cea-608:2015" value="CC2=eng"/> <Accessibility schemeIdUri="urn:scte:dash:cc:cea-708:2015" value="1=lang:eng"/> ``` HLS changes : * We force the language to 2 characters to be consistent with the language of the audio files, for example. * closed_captions is now in packaging_params
Shaka Packager is a tool and a media packaging SDK for DASH and HLS packaging and encryption. It can prepare and package media content for online streaming.
Shaka Packager supports:
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Both Video-On-Demand and Live.
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Streaming formats:
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Key systems:
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Encryption standards:
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Media Containers and codecs
Codecs ISO-BMFF WebM MPEG2-TS WVM Packed Audio² H264 (AVC) I / O - I / O I - H265 (HEVC) I / O - I - - VP8 I / O I / O - - - VP9 I / O I / O - - - AV1 I / O I / O - - - AAC I / O - I / O I O MP3 O - I / O - O Dolby AC3 I / O - I / O - O Dolby EAC3 I / O - O - O MPEG-H Audio I / O - - - - Dolby AC4 I / O - - - - DTS I / O - - - - FLAC I / O - - - - Opus I / O³ I / O - - - Vorbis - I / O - - - IAMF I / O - - - - NOTES:
- I for input and O for output.
- ²: https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-3.4
- ³: Opus support in ISO-BMFF is experimental.
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Subtitles
Format Input Output Text WebVTT Y Y WebVTT in MP4 #405 Y Text TTML ⁴ Y TTML in MP4 - Y DVB-SUB Y - Teletext #272 - - ⁴: TTML input is only supported with TTML output (pass-through, DASH only), see also #584.
- Platforms
- Linux
- Mac
- Windows
- Cross compiling for ARM is also supported.
1: Limited support
Getting Shaka Packager
There are several ways you can get Shaka Packager.
- Using Docker. Instructions are available here.
- Get prebuilt binaries from release.
- Built from source, see Build Instructions for details.
Useful Links
- Announcement List (join for infrequent announcements and surveys)
- Subscribe to releases by following instructions from this blog
- Documentation
- Tutorials
- Several open source players:
Contributing
If you have improvements or fixes, we would love to have your contributions. See https://github.com/shaka-project/shaka-packager/blob/main/CONTRIBUTING.md for details.