TECHNICAL ISO/IEC TS SPECIFICATION 20071-25 First edition 2017-02 Information technology User interface component accessibility . Part 25: Guidance on the audio presentation of text in videos, including captions, subtitles and other on-screen text Technologies de I'information - Accessibilite du composant interface utilisateur Partie 25: Lignes directrices sur la présentation audio de texte dans des vidéos, y compris les legendes, sous-titres et autres textes a I'écran Reference number IEC IS0/IEC TS 20071-25:2017(E) tso International Organization for Standardization STANDARDIZATION C15956617 @IS0/IEC2017 ed without license from IHS IS0/IEC TS 20071-25:2017(E) COPYRIGHT PROTECTEDDOCUMENT IS0/IEC 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDRJSA/IEC O7 - All rights reserved HS und networking permited without license from IHS IS0/IEC TS 20071-25:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 3.1 General terms. .2 3.2 Audio-specific terms 3.3 Language of presentation terms 2 3.4 Production terms 3 4 Framework and process considerations .3 4.1 General 3 4.1.1 Alternate names for the audio presentation of text in videos 3 4.1.2 Motivation for theaudio presentation of text in videos. 4 4.2 Types of text in videos 4 4.2.1 Captions/subtitles 4 4.2.2 Other on-screen text. 5 4.3 Types of audio presentations of text in videos 5 4.3.1 Live and recorded spoken captions/subtitles and spoken on-screen text 5 4.3.2 Pre-mixed and receiver-mixed productions. .6 4.4 Creating and delivering audio presentations of text in videos 6 4.4.1 Narrator preparation. .6 4.4.2 Volume 6 4.4.3 Audioquality 4.4.4 Inclusion of users in creating the audio presentation of text in videos 7 4.4.5 Inclusion of users in evaluating the audio presentation of text in videos .7 4.5 Synchronization. 7 4.6 Text-files .7 5 Guidance on the audio presentation of text in videos 8 5.1 General considerations .8 5.1.1 Different strategies .8 5.1.2 User considerations. ..8 5.1.3 Availability across technologies. .8 5.1.4 Consistency within a video and programme series. 9 5.2 Developing the audio presentation of text in videos 9 5.2.1 Clarityintheaudiopresentationoftextinvideos ..9 5.2.2 Reading/delivering the audio presentation of text in videos .9 5.3 Levels of importance .9 5.4 Guidance on identifying the audio presentation of text in videos .9 5.5 Guidance on identifying characters .10 5.6 Guidance on text and speech adjustments. .10 Bibliography .12 ii censee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS