pub unsafe static AVMediaCharacteristicIsMainProgramContent: Option<&'static AVMediaCharacteristic>AVMediaFormat only.Expand description
A media characteristic that indicates that a track or media selection option includes content that’s marked by the content author as intrinsic to the presentation of the asset.
Example: an option that presents the main program audio for the presentation, regardless of locale, would typically have this characteristic. The value of this characteristic is “ public.main-program-content“. Note for content authors: the presence of this characteristic for a media option is inferred; any option that does not have the characteristic AVMediaCharacteristicIsAuxiliaryContent is considered to have the characteristic AVMediaCharacteristicIsMainProgramContent.
Also see -[AVAssetTrack hasMediaCharacteristic:] and -[AVMediaSelectionOption hasMediaCharacteristic:].
See also Apple’s documentation