Technique SM7:Providing audio description in SMIL 2.0
About this Technique
This technique relates to:
- 1.2.3: Audio Description or Media Alternative (Prerecorded) (Sufficient when used with G173: Providing a version of a movie with audio descriptions)
- 1.2.5: Audio Description (Prerecorded) (Sufficient when used with G173: Providing a version of a movie with audio descriptions)
This technique applies whenever SMIL 2.0 player is available.
Description
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.
Examples
Example 1: SMIL 2.0 audio description sample for RealMedia player
<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>
The example shows a par
segment containing an audio
and a video
tag. The audio stream is not started immediately.
Related Resources
No endorsement implied.
Tests
Procedure
- Find method for turning on audio description from content/player (unless it is always played by default)
- Play file with audio description
- Check whether audio description is played
Expected Results
- #3 is true