AVAssetTrackTimeRangeDidChangeNotification

Posted when the timeRange of an AVFragmentedAssetTrack changes while the associated instance of AVFragmentedAsset is being minded by an AVFragmentedAssetMinder, but only for changes that occur after the status of the value of @“timeRange” has reached AVKeyValueStatusLoaded.

extern NSString * const AVAssetTrackTimeRangeDidChangeNotification;