public function edit($id)
 {
     $mp4 = MP4::whereId($id)->first();
     $cats = Category::orderBy('name')->get();
     if (Auth::check()) {
         $user = Auth::user();
         if ($user->id == $mp4->user_id || $user->is_admin()) {
             $data = ['mp4' => $mp4, 'title' => "Modifye {$mp4->name}", 'cats' => $cats];
             return View::make('mp4.put', $data);
         } else {
             return Redirect::to('/mp4')->withMessage('Ou pa gen dwa pou w modifye videyo a.');
         }
     }
     return Redirect::to('/mp4')->with('message', 'Fòk ou konekte w pou w ka aksede ak paj ou vle a.');
 }