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Accessibility and Embedded Videos: A Helpful Guide

This article applies to: Web Accessibility


Multimedia presentations can be inaccessible to people who are unable to hear their audio content and to people who are unable to see critical information that is presented visually. 

  • For those with hearing impairment the alternative you provide is a transcript.
  • For those who are unable to see all information the alternative you provide is an audio description.
  • Additionally, for an audiovisual presentation, a transcript or an audio visual description does not provide an equivalent experience, because the presentation's message is dependent on the simultaneous interaction between its audio and video portions. For this reason, a text alternative and audio description should be synchronized with the multimedia presentation.

Below is a guide for when you should use transcripts, audio descriptions, and more helpful information. 

Media alternative definitions

Audio Description

To be used for video-only and non-live multimedia content.

If a video in question requires Audio Descriptions (if visual information in the video is important to understanding the message of the video), they must be provided as either an alternative audio track or it can be a different, modified version of the original video.  If a different video is created specifically for the purposes of audio descriptions, it should at least be linked next to the regular version of the video. 

Transcript

To be used for audio-only (and non-live multimedia as an option) multimedia content. A text-format transcript must be provided. It can either be below the video or externally linked near the video.  

Transcripts MUST abide by the following guidelines:

  • All scripted content must be transcribed verbatim.
  • Important background sounds must be conveyed (ideally in brackets or parentheses)
  • The identity of the speaker must be included in transcripts.

Captions

To be used for all multimedia (live and non-live). Captions must be included on all multimedia.  

Captions MUST abide by the following guidelines:

  • All scripted content must be captioned verbatim.
  • Important background sounds must be conveyed (ideally in brackets or parentheses)
  • Any speech that is spoken off-screen must be captioned (italics is best practice for this scenario)
  • The identity of the speaker must be included in captions.
  • Captions must be timed appropriately with the audio.

Type of media format and alternative

Video-only media (non-live)

Video-only media is any non-decorative only video content that has no audio or no audio that is relevant to the content.  The following media alternative is required:

  • Audio Description

Audio-only media (non-live)

Audio only media includes podcasts, conference recordings, and pre-recorded radio broadcasts. This includes externally hosted audio-only content on a video streaming service like YouTube (where any visual content is not relevant to the audio content; i.e. a Cornell logo is displayed for the entire video). They must be accompanied by the following media alternative:

  • Transcript

Non-live Multimedia (audio + video)

Video content that contains audio, requires the following media alternatives:

  • Captions
  • Audio Description (read below)
  • Transcript ifAudio Description is not required

Live Multimedia functionality (audio + video), Live audio-only

Live multimedia (such as a stream), requires the following media alternative:

  • Captions

Note: If an on-demand version of this live multimedia is made, it must then obey the rules for non-live Multimedia.

Live video-only

If streaming live video (such as a livestream of the Cornell Campus without audio) there are no additional media alternatives obligations.

    Multimedia accessibility decision matrix for A* and AA* 

    Captions            

     

    Transcript

     

    Audio Descriptions (AD)**

    Sign Language

     

    Pre-recorded Multimedia

    A: MUST

    AA: MUST

    A: SHOULD

    AA: SHOULD

    A: MUST

    AA: MUST

    A: MAY

    AA: MAY

    Pre-recorded Video-only

    n/a

    A: SHOULD

    AA: SHOULD

    A: MUST

    AA: MUST

    n/a

    Pre-recorded Audio-only

    n/a

    A: MUST

    AA: MUST

    n/a

    A: MAY

    AA: MAY

    Live Multimedia

    A: SHOULD

    AA: MUST

    n/a

    A: MAY

    AA: MAY

    A: MAY

    AA: MAY

    Live Video-only

    n/a

    A: MAY

    AA: MAY

    A: MAY

    AA: MAY

    n/a

    Live Audio-only

    A: MAY

    AA: MAY

    A: MAY

    AA: MAY

    n/a

    A: MAY

    AA: MAY

    *In the matrix table above, A, AA refer to the Web Content Accessibility Guidelines (WCAG) compliance levels.

    ** When producing a video for the web, the need for audio descriptions can often be avoided. If the video were displaying a list of five important items, the narrator might say, "As you can see, there are five important points." In this case, audio descriptions would be necessary to provide the visual content to those with visual disabilities who cannot 'see' what the important points are. However, if the narrator says, "There are five important points. They are..." and then reads or describes each of the points, then the visual content is being conveyed through audio and there is no additional need for audio descriptions.

    Helpful links for media alternatives

    About this Article

    Last updated: 

    Monday, June 11, 2018 - 2:13pm

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