signLanguageInterpretationForAccessibility
A media characteristic that indicates that a track or media selection option provides a sign language interpretation of the spoken dialog and other significant aspects of the presentation.
Declaration
static let signLanguageInterpretationForAccessibility: AVMediaCharacteristicDiscussion
See -[AVAssetTrack hasMediaCharacteristic:] and -[AVMediaSelectionOption hasMediaCharacteristic:]. The value of this characteristic is @“public.accessibility.sign-language-interpretation”. Note for content authors: for QuickTime movie and .m4v files a media option is considered to have the characteristic AVMediaCharacteristicSignLanguageInterpretationForAccessibility only if it’s explicitly tagged with that characteristic. See the discussion of the tagging of tracks with media characteristics below.
Also see -[AVAssetTrack hasMediaCharacteristic:] and -[AVMediaSelectionOption hasMediaCharacteristic:].