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SM7.html
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<!DOCTYPE html><html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><head><title>Providing audio description in SMIL 2.0</title><link rel="stylesheet" type="text/css" href="../../css/sources.css" class="remove"></link></head><body><h1>Providing audio description in SMIL 2.0</h1><section class="meta"><p class="id">ID: SM7</p><p class="technology">Technology: smil</p><p class="type">Type: Technique</p></section><section id="applicability"><h2>When to Use</h2>
<p>
Applies whenever SMIL 2.0 player is available
</p>
</section><section id="description"><h2>Description</h2>
<p>
The objective of this technique is to provide a way for people who are blind or otherwise have trouble seeing the video in audio-visual material to be able to access the material. With this technique a description of the video is provided via audio description that will fit into the gaps in the dialogue in the audio-visual material.
</p>
</section><section id="examples"><h2>Examples</h2>
<section class="example">
<h3>SMIL 2.0 audio description sample for RealMedia player</h3>
<pre xml:space="preserve">
<smil xmlns="https://www.w3.org/2001/SMIL20/Language">
<head>
<layout>
<root-layout backgroundColor="black" height="266" width="320"/>
<region id="video" backgroundColor="black" top="26" left="0"
height="144" width="320"/>
</layout>
</head>
<body>
<par>
<video src="salesdemo.mpg" region="video" title="Sales Demo"
alt="Sales Demo"/>
<audio src="salesdemo_ad.mp3" begin="33.71s" title="audio description"
alt="Sales Demo Audio Description"/>
</par>
</body>
</smil>
</pre>
<p>
The example shows a <par> segment containing an <audio> and a <video> tag. The audio stream is not started immediately.
</p>
</section>
</section><section id="tests"><h2>Tests</h2>
<section class="procedure"><h3>Procedure</h3>
<ol>
<li>
Find method for turning on audio description from content/player (unless it is always played by default)
</li>
<li>
Play file with audio description
</li>
<li>
Check whether audio description is played
</li>
</ol>
</section>
<section class="results"><h3>Expected Results</h3>
<ul>
<li>
#3 is true
</li>
</ul>
</section>
</section><section id="related"><h2>Related Techniques</h2><ul>
<li><a href="../smil/SM2">SM2</a></li>
<li><a href="../smil/SM6">SM6</a></li>
</ul></section><section id="resources"><h2>Resources</h2>
<ul>
<li>
<a href="https://www.w3.org/TR/SMIL/">Synchronized Multimedia Integration Language (SMIL 2.0)</a>
</li>
<li>
<a href="https://www.w3.org/TR/SMIL-access/">Accessibility Features of SMIL</a>
</li>
<li>
<a href="http://ncam.wgbh.org/invent_build/web_multimedia/accessible-digital-media-guide/guideline-h-multimedia#techH12">NCAM Rich Media Accessibility, Accessible SMIL Templates</a>
</li>
</ul>
</section></body></html>