Audio track
An audio track is a distinct sound presentation associated with a media item.
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Accessibility streaming reference
Definitions, mechanisms, examples and practical guidance for accessibility concepts used in streaming and player setup.
A focused reference
Accessibility concepts.
Captions
Captions provide synchronized text for spoken content and relevant non-speech audio, such as speaker identification, music cues or meaningful sound effects.
Explore →Closed captions
Closed captions are captions that the viewer can turn on or off through a supported playback or receiving system.
Explore →Open captions
Open captions remain visible as part of the delivered picture or presentation and do not depend on the viewer enabling a caption track.
Explore →Subtitles
Subtitles are timed text associated with a video, commonly presenting dialogue in the same language or translating it into another language.
Explore →SDH subtitles
Subtitles for Deaf and hard-of-hearing viewers, commonly abbreviated SDH, combine dialogue with relevant sound information and speaker identification.
Explore →Forced subtitles
Forced subtitles provide selected text that an intended audience needs even when it does not want a full subtitle track.
Explore →WebVTT
WebVTT is a text format for cues associated with a media timeline.
Explore →TTML
Timed Text Markup Language, or TTML, is an XML-based system for representing text with timing, layout and styling information.
Explore →SRT subtitle file
An SRT subtitle file is a plain-text representation commonly associated with SubRip captions.
Explore →Subtitle offset
Subtitle offset is a fixed adjustment that moves subtitle cues earlier or later relative to media playback.
Explore →Subtitle encoding
Subtitle text encoding defines how stored bytes are interpreted as written characters.
Explore →Subtitle readability
Subtitle readability is how comfortably viewers can identify and follow on-screen text while watching the programme.
Explore →Audio description
Audio description communicates important visual information through spoken narration so a viewer can understand events that the ordinary soundtrack does not explain.
Explore →Transcript
A transcript presents media information as readable text outside the requirement to follow each cue in real time.
Explore →Screen reader
A screen reader is assistive software that communicates interface content and controls through speech or other supported output.
Explore →TalkBack
TalkBack is Android’s screen-reading accessibility service.
Explore →Keyboard focus
Keyboard focus identifies the interface control that currently receives keyboard input, or analogous directional remote input in a television interface.
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