AVAssetChapterMetadataGroupsDidChangeNotification

Posted when the collection of arrays of timed metadata groups representing chapters of an AVAsset change and when any of the contents of the timed metadata groups change, but only for changes that occur after the status of the value of @“availableChapterLocales” has reached AVKeyValueStatusLoaded.

extern NSString * const AVAssetChapterMetadataGroupsDidChangeNotification;