تفضل يوجد العديد من سكربتات download YouTube videos
https://www.codester.com/items/3948/simple-youtube-video-downloader-script
http://www.phpzag.com/php-youtube-video-downloader-script/
https://www.codespeedy.com/youtube-video-downloader-php-script-download-source-code/
https://github.com/search?l=PHP&o=desc&q=Download+videos&s=stars&type=Repositories&utf8=%E2%9C%93
https://github.com/search?l=JavaScript&o=desc&q=Download+videos&s=stars&type=Repositories&utf8=%E2%9C%93