pub unsafe static AVMediaCharacteristicDescribesVideoForAccessibility: Option<&'static AVMediaCharacteristic>AVMediaFormat only.Expand description
A media characteristic that indicates that a track or media selection option provides descriptions of the visual portion of the presentation that are sufficient to comprehend essential information that it depicts, such as action and setting.
See -[AVAssetTrack hasMediaCharacteristic:] and -[AVMediaSelectionOption hasMediaCharacteristic:]. The value of this characteristic is “ public.accessibility.describes-video“. Note for content authors: for QuickTime movie and .m4v files a media option is considered to have the characteristic AVMediaCharacteristicDescribesVideoForAccessibility 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:].
See also Apple’s documentation