pub unsafe static AVMovieReferenceRestrictionsKey: &'static NSStringAVMovie only.Expand description
Indicates the restrictions used by the movie when resolving references to external media data. The value of this key is an NSNumber wrapping an AVAssetReferenceRestrictions enum value or the logical combination of multiple such values. See AVAsset.h for the declaration of the AVAssetReferenceRestrictions enum.
Some movies can contain references to media data stored outside the movie’s container, for example in another file. This key can be used to specify a policy to use when these references are encountered. If a movie contains one or more references of a type that is forbidden by the reference restrictions, loading of movie properties will fail. In addition, such a movie cannot be used with other AVFoundation modules, such as AVPlayerItem or AVAssetExportSession.
See also Apple’s documentation