public function tryUnpack(File $archiveFile)
 {
     try {
         // wir suchen das srt im archive
         if ($archiveFile->getExtension() === 'rar') {
             // vll geht hier sogar zip?
             $archive = new \Psc\System\SimpleRarArchive($archiveFile);
             $files = $archive->listFiles();
             $srt = NULL;
             $this->logger->writeln('Files im Archiv: ' . implode("\n", $files));
             foreach ($files as $file) {
                 if (\Psc\String::endsWith($file, '.srt')) {
                     $srt = $file;
                     break;
                 }
             }
             if ($srt === NULL) {
                 throw new Exception('Keine .srt Datei im Archiv: ' . $archiveFile . ' gefunden');
             }
             $destination = clone $archiveFile;
             $destination->setExtension('srt');
             $archive->extractFile($srt, $destination);
             if ($destination->exists()) {
                 $archiveFile->delete();
                 return $destination;
                 // alles supi
             }
         }
     } catch (\Exception $e) {
         $this->logger->writeln('Fehler beim Versuch zu entpacken: ' . $e->getMessage());
     }
     return $archiveFile;
 }