Accessible Video: A Workflow for Captions, Description and Transcripts

Plan accessibility while writing the video script. Speak the important information that appears on screen, leave room for explanations and save an accurate transcript. These decisions make the final captions and descriptions easier to produce and give viewers several ways to follow the material.

For an existing recording, begin with two reviews: watch it with the sound muted, then listen without looking at the picture. Note the information missing in each pass. Use those notes to assign caption corrections, visual descriptions and transcript additions before the video is published.

Identify the media and its requirements

The relevant WCAG requirements depend on whether content is prerecorded, live, audio-only or synchronized audio and video. These common cases provide a starting point for a web publishing brief.

Content	WCAG criterion	Level	Production task
Prerecorded video with meaningful audio	1.2.2, Captions (Prerecorded)	A	Provide synchronized captions, subject to the criterion’s clearly labeled media-alternative-for-text exception
Live synchronized media	1.2.4, Captions (Live)	AA	Arrange live captions for the broadcast audio
Prerecorded synchronized media with essential visual information	1.2.5, Audio Description (Prerecorded)	AA	Convey the needed visual information in audio

Read the prerecorded-caption criterion, live-caption criterion and audio-description criterion for their scope. If the main audio already conveys all important visual information, additional audio description is unnecessary. At Level AA, a text transcript alone does not replace required audio description.

Write the applicable requirements into the brief before choosing a player or production service. Include the languages, publishing location and person responsible for reviewing the final files.

Build captions from an accurate audio record

Captions carry speech and meaningful non-speech audio in time with the recording. W3C’s caption guidance also addresses speaker identification and the limitations of uncorrected automatic output. Use an automatic transcript to speed up drafting, then listen through the recording and correct it.

Create a correction list for names, product terms, abbreviations and numbers before editing. In a software tutorial, confusing “disable” with “enable” reverses the instruction. A wrong decimal or menu label can make a demonstration impossible to follow even when most words are accurate.

Add a speaker name when the identity is needed and cannot be understood from the context. Include an important alarm or notification sound when it contributes to the sequence. Keep irrelevant background noise out of the captions so it does not compete with the instruction.

Review timing after text correction. Captions should remain synchronized when the viewer seeks forward, pauses and resumes. Check that line breaks preserve phrases and that captions do not cover the exact control the demonstration asks viewers to select.

Use a separate caption file where the player supports it

WebVTT is a text-track format documented by W3C. A small original example for a screen-recording lesson looks like this:

WEBVTT

00:00:01.000 --> 00:00:04.000
Open Settings, then choose Notifications.

00:00:04.500 --> 00:00:07.500
Clear Email alerts, then select Save.

00:00:08.000 --> 00:00:10.000
[Confirmation tone]

Each cue has a start time, an end time and text. Keep the file with the matching video version. If an editor removes a section from the video, regenerate or retime the captions before replacing the published asset.

Use meaningful language labels in the player and verify that the selected track actually loads. Test on the public page after deployment; a correct file can still fail because of its path, content type, permissions or player configuration. The WebVTT specification provides the format details for implementation.

Write visual information into the narration

W3C’s description guidance covers important actions, visual changes and on-screen text. For a new instructional video, integrate those details into the main narration. Replace “click here” with the control’s name and say what changes after activation.

For example, a script might say, “Select Save. A confirmation appears above the form saying your notification preferences were updated.” That makes the action and its result understandable without seeing the screen. It also gives the caption editor precise language to work with.

For an existing video, identify pauses where a description can fit without competing with dialogue. If there is no room, consider a revised edit or a separate described version with additional time. Include essential text shown on slides, especially figures, warnings and instructions that the speaker never reads aloud.

Keep a timecoded description list. For each item, record what is visible, why it matters and where its spoken equivalent appears. This makes it possible to review completeness without relying on memory.

Publish a useful transcript beside the video

A descriptive transcript combines the relevant spoken and visual information in readable text. W3C’s transcript guidance explains the distinction between a basic audio transcript and a descriptive one. A well-structured HTML version also gives readers headings, links and ordinary text navigation.

For a 3-minute tutorial, organize the transcript by task: open the settings, change the preference and confirm the result. Preserve the actual wording where it matters, and include visual details needed to follow the demonstration. Mark speaker changes consistently.

Place a clearly named transcript link next to the player. If the transcript is on the same page, give it a heading that can be reached directly. Keep any code commands selectable as text rather than embedding them only in screenshots.

Check the player and the delivered package

Use the keyboard to reach Play, Pause, volume, captions and full-screen controls. Confirm that focus is visible and that leaving full-screen mode returns the viewer to a sensible location. A caption file has little value when a viewer cannot operate the control that reveals it.

Then check the presentation at a narrow width and with enlarged text. Look for clipped controls, captions that obscure essential labels and transcript links hidden below unrelated content. Test the actual embedded player, since an accessible video on its original platform can behave differently inside another page.

Assign 3 sign-offs: content accuracy, caption and description completeness, and playback behavior. Store the video, captions, transcript and review notes under the same release identifier. Whenever the recording changes, reopen those checks together so viewers receive a consistent set of materials.