How to change the video resolution from 1280X720 to 600X400

Question: Download the php-ffmpeg library (If not downloaded)?

composer require php-ffmpeg/php-ffmpeg

Question: How to change the video resolution from 1280 X 720 to 600 X 400?

    //load the library
    require_once 'ffmpeglib/vendor/autoload.php'; 
    $ffmpeg = FFMpeg\FFMpeg::create();

    //format of new video
    $format = new FFMpeg\Format\Video\X264();
    $format->setAudioCodec("aac");           

    //path of folder where video exist
    $videoFolderPath='folder';

    //change the resolution
    $width=600;
    $height=400;


    //load the video in ffmpeg
    $videoObj = $ffmpeg->open($videoFolderPath.'/input_video.mp4');
    //filter the video with height/width
    $videoObj->filters()->resize(new FFMpeg\Coordinate\Dimension($width, $height), FFMpeg\Filters\Video\ResizeFilter::RESIZEMODE_INSET, true);
    //save the video
    $videoObj->save($format, $videoFolderPath.'/output_video.mp4');