Accessibility Metadata in Broadcasting: Audio Description, Closed Captions, and More

Television accessibility is a legal obligation, a viewer experience priority, and a social responsibility — and none of it works without accurate metadata. The audio description flag that activates a viewer’s screen reader, the closed caption indicator that tells a platform which programmes carry text subtitles, and the subtitle language attributes that enable a hard-of-hearing viewer to navigate to content accessible to them are all metadata fields. When those fields are correct, accessibility features work invisibly and reliably. When they are absent or wrong, viewers who depend on those features are denied equal access to content — and in many markets, broadcasters and platforms face regulatory consequences for that failure.

This article explains what accessibility metadata covers, why it matters, and what broadcasters and platform operators need to know about maintaining it correctly.

The Core Accessibility Metadata Fields

Audio Description (AD)

Audio description is a narrated audio track that describes the visual elements of a programme — action, scene settings, facial expressions, text on screen — for viewers with visual impairments. It is typically delivered as a secondary audio track alongside the main programme audio and activated by the viewer through their platform or device settings.

The audio description metadata flag communicates to the platform and the viewer that an AD track is available for a given programme. Without this flag being correctly set in the EPG and content metadata, viewers who require audio description have no reliable way to identify which programmes carry it — and assistive technology that depends on the AD flag cannot activate the feature automatically.

In the United Kingdom, Ofcom requires qualifying broadcasters to provide audio description for a minimum percentage of their programming. The accuracy of AD flags in EPG metadata is part of the compliance record — regulators can audit whether content marked as AD-enabled actually carries an audio description track, and whether programmes with AD tracks are correctly flagged in the guide.

Closed Captions and Subtitles

Closed captions are a text representation of the audio content of a programme — dialogue, speaker identification, sound effects, and music cues — designed for viewers who are deaf or hard of hearing. They differ from standard subtitles, which typically provide a text transcription of dialogue only (without sound effect descriptions or speaker identification) and are primarily intended for viewers watching content in a language other than their own.

Accessibility metadata for subtitles and captions includes:

• Closed caption availability flag: Indicates that a programme carries closed captions (hard-of-hearing subtitles)
• Subtitle language attributes: The language or languages in which subtitle tracks are available, enabling multilingual platforms to surface subtitle options to viewers browsing in their preferred language
• Hard-of-hearing subtitle flag: Distinguishes between standard translation subtitles and subtitles specifically designed for hearing-impaired viewers, which carry additional descriptive information
• Sign language availability: Where a programme has been signed (with a sign language interpreter in vision or via a secondary video track), a flag indicating the availability of this feature

As with audio description, caption and subtitle metadata flags are subject to regulatory obligations in most major markets. Ofcom requires UK qualifying broadcasters to provide subtitles on a minimum percentage of their output. Similar obligations apply under the EU Audiovisual Media Services Directive and national frameworks across European markets, Australia, Canada, and the United States.

Flashing Images Warning

Content containing flashing lights or rapidly alternating visual patterns can trigger photosensitive epileptic seizures in susceptible viewers. The flashing images warning metadata flag communicates this risk to the platform and the viewer — enabling display of an on-screen warning before the programme begins.

This is a viewer safety flag. Its absence means that susceptible viewers may not receive the advance warning they need to make an informed decision about whether to watch a programme. Its presence, displayed prominently before transmission, reduces the risk of seizure incidents and is part of broadcasters’ duty of care to their audiences.

Why Accessibility Metadata Fails — and What It Costs

Accessibility metadata failures are more common than they should be, and they arise from several systemic causes:

Inconsistent Sourcing

Audio description tracks and closed captions are often produced by separate teams or third-party suppliers from the main production. The metadata flag confirming their availability needs to be added to the EPG record after the AD or caption track has been confirmed as available — a workflow that requires coordination between production, accessibility, and metadata teams. When that coordination breaks down, programmes air with AD tracks not flagged, or flags are applied to programmes where the AD track was not ultimately delivered.

Catch-Up and VOD Discrepancy

A programme that carries an AD track in its linear broadcast transmission may not carry the same track when it transitions to catch-up or VOD availability — particularly where the on-demand version is delivered through a different platform with different accessibility track delivery capabilities. Metadata that accurately reflects the linear transmission’s accessibility flags may be incorrect for the on-demand version of the same programme.

International Distribution Gaps

AD tracks and closed caption tracks produced for a UK or US original transmission may not be included in the version of the content licensed to international platforms. An international distributor who applies the source metadata — including accessibility flags from the original market — to a version of the content that does not carry the corresponding accessibility tracks will present incorrect information to international viewers.

The Regulatory Landscape

Accessibility obligations for broadcasters and streaming platforms are growing in scope and enforcement across most major markets:

United Kingdom: Ofcom sets minimum accessibility quotas for qualifying broadcasters — currently 100% of programmes subtitled, 10% with audio description, 5% signed (targets vary by broadcaster tier). Streaming services with significant UK audiences are increasingly brought within scope of these obligations. EPG accuracy for accessibility flags is part of compliance monitoring.

European Union: The Audiovisual Media Services Directive requires member states to ensure that video-on-demand services are progressively made more accessible to people with disabilities, including through accurate accessibility metadata. National implementation varies but the direction of travel is consistent: increasing mandatory accessibility provision.

United States: The Twenty-First Century Communications and Video Accessibility Act (CVAA) mandates closed captioning for online video content that has previously appeared on television. The FCC’s audio description rules require qualifying broadcasters to provide AD on a percentage of their programming. Streaming services are subject to expanding FCC guidance on accessibility requirements.

Australia: The Broadcasting Services Act requires commercial free-to-air broadcasters to meet minimum captioning requirements. ACMA monitors compliance, and streaming services are subject to accessibility guidelines under the Disability Discrimination Act.

Accessibility Metadata as a Viewer Experience Priority

Regulatory compliance is a floor, not a ceiling. For broadcasters and platforms that take accessibility seriously — as an audience commitment rather than a compliance exercise — accurate and comprehensive accessibility metadata is a viewer experience priority.

An estimated 15% of the global population lives with some form of disability. For those viewers who depend on audio description, closed captions, or other accessibility features, the quality of accessibility metadata directly determines whether they can fully participate in television culture. A guide that does not reliably surface which programmes carry AD, or that incorrectly flags programmes as captioned when captions are absent, fails those viewers — not abstractly, but practically and daily.

Getting accessibility metadata right is, ultimately, a question of whether a platform’s programme guide serves the full range of its audience. The answer to that question is encoded in a set of metadata flags that most viewers will never notice — and that some viewers cannot do without.

Related reading: What Is TV Metadata? The Complete Guide | Content Ratings and Classification Metadata | Why EPG Accuracy Matters

Global Listings manages accessibility metadata — audio description flags, closed caption attributes, subtitle language data, and content warnings — as part of our full EPG and enhanced metadata service. Learn more or contact our team.