Web checklist

Checkpoint 1.2c: Live multimedia

Captions are provided for live multimedia.

Rationale

The purpose of this checkpoint is that equivalent alternatives are provided for any multimedia presentation, including live multimedia. These equivalent alternatives must be synchronized with the presentation. This is normally done through computer assisted real time (CART) captioning, where an operator listens to the call, and then repeats the content back out loud. At that point, a voice recognition software package trained to their voice creates the live captions.

Required development techniques

Compliance with this checkpoint requires the following technique to be met.

Live captions: Create captions for live multimedia.

Examples for General developers

1. Live captions: Create captions for live multimedia.

Example 1

The IBM CFO makes a quarterly presentation to IBM stockholders that is broadcast live on IBM.com. A real-time captioning service is provided for hearing impaired users.

For additional information and examples, refer to WCAG 2.0 examples for Creating captions for live synchronized media (link resides outside of ibm.com) and Captions (live) (link resides outside of ibm.com).

Recommended development techniques

The techniques above are required; the following techniques are recommended to enhance accessibility:

Ensure your captions adhere to WCAG 2.0 captioning guidelines (link resides outside of ibm.com).
Provide a note saying "No sound is used in this clip" for video-only clips. Use SMIL 1.0 to provide captions for all languages for which there are audio tracks.
Use SMIL 2.0 to provide captions for all languages for which there are audio tracks.
Provide audio descriptions in multiple languages in SMIL 1.0.
Provide audio descriptions in multiple languages in SMIL 2.0.
Provide a pop-up text window for a short audio presentation.

Required test techniques

The following test tools and techniques are required to test this checkpoint.

Test tools
Required accessibility verification test techniques

Test tools:

Install the following tools to test this checkpoint:

Web syntax analyzer

Required accessibility verification test techniques:

Use the following accessibility verification test (AVT) techniques to validate the Web content. It is recommended that these tests be performed in order.

**1. Web syntax analyzer test:**
Action	Result
Test the Web site with a Web syntax analyzer to verify the compliance criteria as follows No live multimedia are identified. For any live multimedia identified by the Web syntax analyzer, the compliance criteria is addressed by completion of the 2. Manual test listed below.	Pass: All applicable compliance criteria in the action column to the left are verified to be true. Fail: Any failure from applicable compliance criteria in the action column to the left.

**2. Manual test:**
Action	Result
Verify the compliance criteria as per instructions below. Creating captions for LIVE multimedia. Before the broadcast, verify that there is a process in place to provide real-time captioning of audio and video content for the live broadcast. During the broadcast, monitor the broadcast to ensure that the delivery of captions occurs in real-time.	Pass: All applicable compliance criteria in the action column to the left are verified to be true. Fail: Any failure from applicable compliance criteria in the action column to the left.

Last updated May 28, 2009.

W3C Recommendation 11 December 2008: http://www.w3.org/TR/WCAG20/ (link resides outside of ibm.com)
Copyright 1994-2009 W3C (Massachusetts Institute of Technology, European Research Consortium for Informatics and Mathematics, Keio University), All Rights Reserved.

Checkpoint 1.2b

Web checklist

Checkpoint 1.3a