An alternative for time-based media or audio description of the prerecorded video content is provided for synchronized media. (Level A)
People who are blind or visually impaired need access to the visual information that is provided in multimedia.
The visual information is described using one of the following:
- An audio description (also called video description or descriptive narration) is either added to the existing audio track during pauses in the existing audio content or on an alternate audio track. A narrator describes the important visual details that are not already explained in the soundtrack, including information about actions, text information not verbally described, who is speaking, facial expressions, scene changes, and so on.
- A full text alternative is a transcript that includes descriptions of all of the visual details, including the visual context, actions and expressions of the actors, and any other visual content, as well as the auditory information - the dialogue, who is speaking, sounds (as would be contained in captions). The goal is to give a person who is blind or visually impaired the same information a sighted user would get from the media. People who are deaf, hard of hearing, or who have trouble understanding audio information also benefit because they can read the text alternative as a transcript of the audio or video information.
Exception: When the media is a media alternative for text and is clearly labeled as such.
Note: This checkpoint overlaps with Checkpoint 1.2.5: Audio Description (Prerecorded). If an audio description is used to meet 1.2.3, 1.2.5 is also met.
Note: Anything which has a play button is typically “time-based media,” which includes anything that has duration and plays to the user over time. Video, audio and animation are all time-based media.
Refer to Understanding SC 1.2.3 for more information (external link to WCAG).
Review the General techniques as well as other tabs applicable to your technology. Prioritize the use of technology-specific techniques, and implement the General techniques as needed. You are always required to find, understand and implement accessible code techniques to meet the checkpoint. The documented techniques and supplements are not exhaustive; they illustrate acceptable ways to achieve the spirit of the checkpoint. If numbered, techniques are in order of preference, with recommended techniques listed first. Where used, IBM information that complements the WCAG techniques is indicated as supplemental.
Instructions: Any item in this section represents a technique or combination of techniques deemed sufficient.
- G69: Providing an alternative for time based media
- G58: Placing a link to the alternative for time-based media immediately next to the non-text content AND G69: Providing an alternative for time based media
- G78: Providing a second, user-selectable, audio track that includes audio descriptions
- G173: Providing a version of a movie with audio descriptions
- G8: Providing a movie with extended audio descriptions
- G203: Using a static text alternative to describe a talking head video
Instructions: Any item in this section represents a technique deemed sufficient to address particular situations.
- Meeting G69: Providing an alternative for time based media with:
- Meeting G173: Providing a version of a movie with audio descriptions using one of the following:
- Meeting G8: Providing a movie with extended audio descriptions using one of the following:
There are no specific Mobile Native iOS technniques for this checkpoint. However, in addition to the General and Web techniques, the techniques in this section provide additional information and context for hybrid applications.
Meeting G173: Providing a version of a movie with audio descriptions using the following:
Apple recommends using the HTML5
There are no specific Eclipse techniques for this checkpoint. Refer to the General techniques section.
There are no specific Windows-based (MSAA+IA2) techniques for this checkpoint. Refer to the General techniques section.
Most links in this checklist reside outside ibm.com at the Web Content Accessibility Guidelines (WCAG) 2.0. W3C Recommendation 11 December 2008: http://www.w3.org/TR/WCAG20/
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