AVErrorFileTypeKey The user information key to retrieve the file type. Declarationlet AVErrorFileTypeKey: String See AlsoUser info keysAVErrorDeviceKeyAVErrorDiscontinuityFlagsKeyAVErrorFileSizeKeyAVErrorMediaTypeKeyAVErrorMediaSubTypeKeyAVErrorPersistentTrackIDKeyAVErrorPIDKeyAVErrorPresentationTimeStampKeyAVErrorRecordingSuccessfullyFinishedKeyAVErrorTimeKey