isMainProgramContent
A media characteristic that indicates a track or media selection option includes content its author indicates is essential to the asset’s presentation.
Declaration
static let isMainProgramContent: AVMediaCharacteristicDiscussion
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.
The system infers the presence of this characteristic for a media option; it considers any option that doesn’t have the characteristic isAuxiliaryContent to be main content.