The id of the media track that is used to identify and set the track.
OptionalisIndicates whether the subtitle is fragmented.
OptionalisIndicates whether the subtitle is sideloaded, i.e. it has been added through PlayerSubtitlesAPI.add or SourceConfig.subtitleTracks.
The subtitle type, either "caption" or "subtitle" (default: "subtitle").
The text used to represent this track to the user (e.g. in the UI).
The language of the subtitle/caption track.
OptionalmetadataOptional custom metadata about the track. This is currently only supported for DASH manifests, where these are populated from SupplementalProperty elements.
OptionalroleThe optional roles of the track.
OptionalurlThe URL to the associated file.
Definition of a text track.