pub unsafe static AVCaptionMediaSubTypeKey: Option<&'static AVCaptionSettingsKey>Available on crate feature
AVCaptionSettings only.Expand description
Indicates the output media subtype of a caption conversion operation. For example, [NSNumber numberWithInt:kCMClosedCaptionFormatType_CEA608].
Both numeric and string forms of media subtypes are accepted for caption conversions, so you could, for example, use “ c608“ instead of [NSNumber numberWithInt:kCMClosedCaptionFormatType_CEA608].
See also Apple’s documentation