EBU-TT Live v0.8 published

All,

Wearing my EBU XML Subtitles group co-chair hat, I'd like to point you to
a recent publication by EBU of a v0.8 draft for comments Live subtitle
contribution specification, which may be seen as an application of TTML1.

The news article published by EBU is at
https://tech.ebu.ch/news/2015/06/19/ebu-tt-subtitling-goes-live

The document itself is can be downloaded directly (PDF) from
https://tech.ebu.ch/docs/tech/tech3370.pdf


Extract from the Scope:

[[
This document describes how EBU-TT [EBUTT1] can be used in a broadcasting
environment to carry
subtitles that are created in real time (“live”) from an authoring station
to an encoder prior to
distribution, via intermediate processing units. It does this by
specifying:

* a system model consisting of processing nodes that pass streams of
subtitles along a chain;
* a content profile based on EBU-TT Part 1 specifying the data format of
each document in a
live subtitle stream.
* a mechanism by which content providers can model and potentially improve
synchronisation
between the subtitles and the audio to which they relate;

]]

The general approach taken is to define a sequence of documents, of which
zero or one may be active at any given moment in presentation time, and to
define the temporal activation rules of those documents for presentation,
i.e. how to resolve the begin and end times of each document.

A sequence number parameter is required for that resolution process.

Concepts such as management of delay and handover between different
streams are also discussed/specified.


I'd encourage all with an interest in this topic to review the document
and 1) feed back any comments by email to subtitling@ebu.ch and 2)
consider if any of the concepts introduced would merit adoption in TTML,
for example the sequence identification and numbering parameters and the
document activation time resolution rules.

Kind regards,

Nigel



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Received on Friday, 3 July 2015 08:57:08 UTC