public function convertToMp3($source, $target)
    {
        $this->serviceLocator->setShared('playgroundcore_phpvideotoolkit', false);
       
        $this->serviceLocator->get('playgroundcore_phpvideotoolkit')
            ->addPreInputCommand('-y')
            ->addCommand('-i', $source)
            ->addCommand('-vn')
            ->addCommand('-ar', '44100')
            ->addCommand('-ac', '2')
            ->addCommand('-ab', '192')
            ->addCommand('-f', 'mp3')
            ->setOutputPath($target)
            ->execute();
        
        return $target;
    }