ActionScript 3.0 :: Generate Thumbs Of Video Objects?

I need the first frame of a video-object.My first guess was to pause the netstream object immediately after the play method and use the seek / close methods when the bufferLength is > 0.1.But I dont get a picture yet :/ ...
  
Code:
 
public class VideoThumb extends MovieClip    {                private var nc:NetConnection = new NetConnection();        private var ns:NetStream;        private var vid:Video = new Video(200,140);        private var netClient:Object = new Object();                private var prjInfo:ProjectInfo;        private var _duration:Number;                                public function

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