AVErrorPIDKey The user information key to retrieve the process ID value. Declarationlet AVErrorPIDKey: String See AlsoUser info keysAVErrorDeviceKeyAVErrorDiscontinuityFlagsKeyAVErrorFileSizeKeyAVErrorFileTypeKeyAVErrorMediaTypeKeyAVErrorMediaSubTypeKeyAVErrorPersistentTrackIDKeyAVErrorPresentationTimeStampKeyAVErrorRecordingSuccessfullyFinishedKeyAVErrorTimeKey