composer require jackal/video-downloader-ext-facebook
use Jackal\Downloader\Ext\Facebook\Downloader\FacebookDownloader;
require_once __DIR__ . '/vendor/autoload.php';
$facebookVideoId = '624784478047637';
$vd = new \Jackal\Downloader\VideoDownloader();
$vd->registerDownloader(FacebookDownloader::VIDEO_TYPE, FacebookDownloader::class);
$downloader = $vd->getDownloader(FacebookDownloader::VIDEO_TYPE, $facebookVideoId, [
'format' => ['hd'],
]);
$downloader->download(__DIR__ . '/output.avi');