Accessibility/Video a11y requirements
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Accessibility on video should satisfy the following needs:
- subtitles: transcription of what is being said in different languages
- captions: subtitles for the deaf, which include sound effects as well as speech transcripts
- audio annotations as text: description of what is happening in the video through an additional textual annotation track (enabling TTS, Braille outputs)
- sign language as text?
Out of scope, but important to understand how to include into Ogg:
- burnt-in captions are out of scope, because they are just part of the video track anyway and not easily machine accessible other than through OCR
- audio annotations as digital audio are out of scope, because they can just be multiplexed as an additional audio track into a multitrack Ogg file
- sign language video track are out of scope, because they can just be multiplexed as an additional video tracl into a multitrack Ogg file