Audio-video content
Ensure all audio-video media has accurate captions, descriptive audio, clear speech, and transcripts. Avoid distracting background sounds. Human-reviewed captions are crucial for accessibility.
Making audio and video content accessible
Audio-video content
For pre-recorded synchronized audio-video content, both descriptive audio and timed captions should be provided. It may be tempting to rely on auto-transcription services to generate captions. However, in many cases these services will not provide anything that could reasonably be considered “equivalent content” for WCAG compliance.
To go above and beyond, consider providing captions for live synchronized audio-video content as well.
Speech-based audio content
For speech-based audio content, avoid having any background music or sounds that distract from the message being communicated. If there are ongoing background sounds, these should be at least 20 dB lower than the foreground speech content. If you wish to include background sounds that are typically louder than this, you should give the user the ability to turn off these sounds altogether. Furthermore, provide transcripts and captions for speech based audio content.