PDF/UA-1 · CLAUSE 7.18.6.2
Multimedia clip is missing required description
A media clip data dictionary is missing the CT (content type) or Alt (alternative description) key.
Why it matters
Users who cannot see or hear the media get no description of what it contains, and the player may not know how to handle it.
How to fix it
- Set the CT key to the MIME type of the media, for example video/mp4.
- Provide an Alt description summarising the media content.
- Supply captions and a transcript alongside the document for substantial audio or video.
WCAG 1.2.1 Audio-only and Video-only (A)
WCAG 1.2.2 Captions (Prerecorded) (A)
What the standard says
In the media clip data dictionary, the optional CT key (ISO 32000-1:2008, 13.2.4.2, Table 274) is required
Check your own PDF
Validate a file against PDF/UA-1 and see whether this rule fails in your document.
curl -sS -X POST "https://api.ua1.dev/api/validate?format=compact&profile=ua1" \ -F "file=@document.pdf"