I am sorry I didn't refresh my page and becuase of that IO didn't see your reply ;-)
You can close this topic, I have found a possible solution by myself.

This is the solution: (if this is illegal to publish own modifications then remove this piece of code):

Open include/classes/class.video_player.php
Add on line 27 this code:
Code:
$this->video_seo = $video_info['seo_name'];
Add on line 70 this code:
Code:
$video_seo_name = $this->video_seo;
The var $video_seo_name will give the seo_name and you don't have to make a query in player.inc . This means less queries for your server!