Пробуем настроить формат видео

app/Http/Controllers/YoutubeDownloadController.php

@@ -17,7 +17,8 @@ class YoutubeDownloadController extends Controller
             Options::create()
                 ->downloadPath(env('PATH_TO_DOWNLOAD'))
                 ->url($url)
-                ->remuxVideo('mp4')
+                ->formatSort(['bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo+bestaudio'])
+                ->mergeOutputFormat('mp4')
         );
         $videotitle = '';
         foreach ($collection->getVideos() as $video) {
@@ -28,7 +29,7 @@ class YoutubeDownloadController extends Controller
                 return response(json_encode($response));
             } else {
                 $videotitle = $video->getFile()->getFilename(); // Will return Phonebloks
-                $videotitle = str_replace('webm', 'mp4', $videotitle);
+                //$videotitle = str_replace('webm', 'mp4', $videotitle);
                 //$file_path = public_path('/'.'downloads/'.$videotitle);
         	    //return response()->download($file_path);
                 // $video->getFile(); // \SplFileInfo instance of downloaded file