public static function fileHasVideoAndAudio($full_file_path)
 {
     $audio = $video = true;
     $audio_video_status = myFileConverter::videoAudioStatus($full_file_path);
     if ($audio_video_status == myFileConverter::VIDEO_ONLY) {
         $audio = false;
     } elseif ($audio_video_status == myFileConverter::AUDIO_ONLY) {
         $video = false;
     }
     return array($video, $audio);
 }