bool CheckHeader ( bool bInFileExisted, [TArray](API\Runtime\Core\Containers\TArray)< [FMovieSceneSessionInfo](API\Editor\SerializedRecorderInterface\Serializers\FMovieSceneSessionInfo) > & SessionInfos, HeaderData & InOutHeader, int64 & ReadHeaderPos, [FText](API\Runtime\Core\Internationalization\FText) & OutFailReason )