I have been advised to post this problem here from the AS3 Forum as it is to do with OSMF but I think my problem is in the AS3 code. I have created a DefaultMediaFactory element and added it to the stage  but it is not showing. I am using three classes Main, LoadTextVariables and finaly the PayVideo class. I first set the stage width and height in a Main  Class then call a LoadTextVariables class which gets the name of the  video to play from an external text file. On loading the variables is  complete it calls a PlayVideo class which creates the  DefaultMediaFactory and loads the chosen video and displays it. All this works well  except I can't see the video. I can hear the audio so I know it is playing. There are no other objects on the stage to hide anything. This is the code for creating the DefaultMediaFactory in the PlayVideo class:

package
{
   
    import flash.display.Sprite;
    /*import flash.display.StageAlign;
    import flash.display.StageScaleMode;*/
   
    import org.osmf.containers.MediaContainer;
    import org.osmf.elements.VideoElement;
    import org.osmf.layout.LayoutMetadata;
    import org.osmf.media.DefaultMediaFactory;
    import org.osmf.media.MediaElement;
    import org.osmf.media.MediaFactory;
    import org.osmf.media.MediaPlayer;
    import org.osmf.media.MediaPlayerSprite;
    import org.osmf.media.URLResource;
   
    public class PlayVideo extends Sprite
    {
        public var videoToPlay:String;
        private var _layout:LayoutMetadata;
        private var _mediaContainer:MediaContainer;
        private var _mediaElement:MediaElement;
        private var _mediaFactory:MediaFactory;
        private var _mediaPlayer:MediaPlayer;
        public var isOK:Boolean=false;
       
       
        public function PlayVideo(video:String)
        {
            videoToPlay=video;
            trace("got to PlayVideo",videoToPlay);
            playVid();
        }
        public function playVid():void{
            trace("got to playVid",videoToPlay);
            _mediaPlayer = new MediaPlayer();
            _mediaPlayer.autoRewind = false ;
           
           
            // Assign the resource to play. DefaultMediaFactory generates the appropriate
            // MediaElement and passes it to the MediaPlayer.
            _mediaFactory=new DefaultMediaFactory();
            _layout = new LayoutMetadata();
            _layout.width=stage.stageWidth;
            _layout.height=stage.stageHeight;
            _layout.x=0
            _layout.y=0
            _mediaContainer = new MediaContainer();
            addChild(_mediaContainer);
            _mediaElement = _mediaFactory.createMediaElement(new URLResource(videoToPlay));
            _mediaElement.addMetadata(LayoutMetadata.LAYOUT_NAMESPACE, _layout);
            _mediaPlayer.media = _mediaElement;
            _mediaContainer.addMediaElement(_mediaElement);
           
            trace("I am now playing the video= ",videoToPlay);
           
        }
    }
}

Any help with this would be appreciated.