These are intended to serve as the basis for all subtitle work across the BBC (prepared and live, online and broadcast, internal and supplied) Quality Control Tests The EBU has also developed a recommendation on the transport of subtitles inside and outside of MXF files ( EBU R 133).ĮBU Member BBC has published BBC Subtitles Guidelines. Other specs reference EBU-TT-D, such as HbbTV 2.0, DVB TTML Subitling and Freeview Play. There also is a document for the use of EBU-TT-D in ISO BMFF / MPEG-DASH ( EBU Tech 3381). EBU-TT-DĮBU-TT part 'D' ( EBU Tech 3380) is the format for the distribution of subtitles over IP. It was used to test the specification in code and is a useful resource when adding EBU-TT Live support to products. This is not an official EBU spec, but an Open Source project that builds on the EBU-TT Live spec. It describes how to carry EBU-TT-Live streams using WebSocket. These mechanisms can be defined in supplemental publications. EBU-TT WebSocket Carriage SpecificationĮBU-TT Live does not prescribe which carrier mechanisms to use. This part is also known as 'EBU-TT Live'. It further introduces the concept of processing 'nodes' that can help improve subtitling quality in production. EBU-TT Part 3: Live contributionĮBU-TT Part 3 ( EBU Tech 3370) provides a System Model and Content Profile for authoring and contribution of live (and prepared) subtitling. This makes it easier to maintain an overview and avoid duplication. Since May 2017, the EBU-TT metadata elements are defined in a single document ( EBU Tech 3390). EBU-TT Part 2: STL mappingĮBU-TT Part 2 ( EBU Tech 3360) is a mapping guide on how to map EBU STL files to EBU-TT. It builds on the W3C Timed text Markup Language (TTML) 1.0. The EBU-TT family consists of the following specifications: EBU-TT Part 1: Archive & ExchangeĮBU-TT Part 1 ( EBU Tech 3350) defines an easy-to-use XML structure for the interchange and archiving of subtitles.

EBU-TT is the follow-up to the widely used EBU STL format ( EBU Tech 3264). To meet broadcasers' requirements, the EBU Timed Text Group has created EBU-TT, which stands for EBU Timed Text.

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