BS PD ISO/IEC TS 20071-25:2017

BS PD ISO/IEC TS 20071-25:2017 provides recommendations on the audio presentation of captions/subtitles and otheron-screen text for use in all type of videos regardless of the language and technology being used totransmit and present the recorded or live video.This document applies to making captions/subtitles and other on-screen text accessible to users withvarious needs, including but not limited to people with learning and reading disabilities, people withcognitive disabilities, people who are blind or have low vision, older people, and non-native languagespeakers. It does not apply to captions/subtitles or other on-screen text whose content is alreadyprovided in the soundtrack in a language and a way users can access.This document provides guidance on spoken captions/subtitles as a stand-alone access service but italso provides guidance on how to integrate spoken captions/subtitles, other spoken on-screen text andaudio description, if needed, in different types of videos.NOTE 1 Extensive guidance on audio description is provided in ISO/IEC/TS 20071-21.This document does not consider the devices or transmission mechanisms used to deliver and playthe content or the audio presentation of text in videos. These devices include, but are not limited totelevisions, computers, wireless devices, projection equipment, DVD and home cinema equipment,cinema equipment and other forms of user interfaces technology. Therefore, this document does notconsider transcoding files for the various video and audio outputs.NOTE 2 Technical matters of transmission and distribution are covered by other documents (e.g. MPEGstandards and other technical standards such as IEC 62731:2013).This document acknowledges the various needs and preferences of users, as well as the differentapproaches to the audio presentation of text in videos.It applies to audio presentations intended to be heard simultaneously along with the original video.Cross References:ISO/IEC/TS 20071-21IEC 62731:2013