IRT leads the collaborative work:
MPEG-DASH Live Streams with EBU-TT-D subtitles
— The Collaborative Work
IRT and partners engaged in collaborative work on the MPEG-DASH (Dynamic Adaptive Streaming over HTTP) and the TTML profile EBU-TT-D (EBU Timed Text-Distribution) to provide a standardised approach for live streamed subtitles.
The collaborative work as presented by IRT, one of the HBB4ALL partners:
- IRT and partners make samples of live MPEG-DASH streams with EBUTT-D subtitles publicly available
- Tests in cooperation with IRT, Akamai, Keepixo, BR and DasErste
- Sample streams publicly available
- Showcase established as part of the European project HBB4ALL
— The Demo Page
The demo streams are publicly available for anyone interested, specifically to demonstrate the potential of MPEG-DASH and EBU-TT-D to service providers and to the industry: http://subtitling.irt.de
— The IRT press release
“Standardised approach for subtitles in live streams on PC, mobile and SmartTV”
IRT, the research centre of the public broadcasters in Germany, Austria and Switzerland, in close cooperation with the CDN Provider Akamai,
the IPTV and OTT solutions provider Keepixo and the German public broadcasters Bayerischer Rundfunk (BR) and DasErste have provided two sample live Internet streams to demonstrate the potential benefit of these technologies. The work was carried out in the scope of HBB4ALL.
The implementation shows how future multiplatform access to live streams with subtitling can be realised. Any online device can access the same service: primarily in focus are PCs and mobile devices, e.g. tablets and smartphones, but future SmartTVs based on HbbTV 2.0 can also access the subtitled streams, because MPEG-DASH and EBU-TT-D are natively supported by the new HbbTV version.
IRT press release gives more details about this work:
— The co-Workers
With support from HBB4ALL, the associate partners are:
- IRT coordinated the efforts and reviewed the sample streams,
- Akamai provides the CDN facilities and made necessary changes to support the live MPEG-DASH streaming service with subtitles,
- BR (Bayerischer Rundfunk) is the content provider of the first, live program stream, integrated the Keepixo encoder in its operational streaming environment and provides both DASH streams,
- Das Erste provided the content for the second, “semi-live” looped MPEG-DASH Stream which can be accessed worldwide without geo-blocking,
- Keepixo implements subtitle translation into EBU-TT-D, video transcoding into 6 profiles and MPEG-DASH packaging using its video encoding solution.