Category Archives: Accessibility

“Inter-Device Synchronization” using HbbTV2

The “inter-device synchronization” feature of the HbbTV2 standard allows the playback of IP AV streams on a mobile device in lip-sync with the broadcast TV image on the TV. One of the most important use cases for this is the provision of additional audio versions via mobiles and headphones, e.g. for use in a family …

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Subtitles for 360° media – alternative presentation for immersive experiences

Introduction When subtitles are provided in a 360° environment, they are typically fixed at the bottom of the screen and centered horizontally. This is fine for common 2D TV, but maybe is not the best strategy for 360° media. By making use of the additional “dimension”, maybe subtitles can convey more than just textual information. …

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Subtitle Conversion Framework (SCF) v1.0 released

IRT recently released version 1.0 of it’s Subtitle Conversion Framework (SCF). The SCF is published under the Apache 2.0 license and is available on github: https://github.com/IRT-Open-Source/scf The SCF provides a set of modules for converting XML based subtitle formats. The modules include features for Transformation from EBU STL to EBU-TT according to the mapping guideline …

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Synchronised Holograms

Synchronising an augmented-reality experience to a broadcast programme on an HbbTV 2 device Version 2 of the HbbTV standard, introduces several new features. Probably the most interesting set of features target at combining mobile devices such as tablets or smartphones with HbbTV devices. These so-called companion-screen features allow creating distributed media experiences, in the sense …

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CMAF Livestreams with Subtitles and Audio Description

The Common Media Application Format (CMAF) aims at unifying the two currently leading adaptive streaming standards: MPEG-DASH and Apple’s HLS. The sample live streams presented here, demonstrate the potential benefit of CMAF for future OTT IP services. With CMAF, both HLS playlists and DASH manifests are allowed to reference the same fragmented MP4 (fMP4) chunks, …

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