NsExampleVideoSizeEqualsStageSize6.as

package
{
    import flash.accessibility.Accessibility;
    import flash.display.Sprite;
    import flash.events.*;
    import flash.net.NetConnection;
    import flash.net.NetStream;
    import flash.media.Video;

    public class NsExample extends Sprite
    {
        private var nc:NetConnection;
        private var ns:NetStream;
        private var video:Video;

        public function NsExample()
        {
            video = new Video();
            addChild(video);

            nc = new NetConnection();
            nc.client=this;
            nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
            nc.addEventListener(AsyncErrorEvent.ASYNC_ERROR, onError);
            nc.connect('rtmp://live.7cast.net/live');
        }

        private function startStreaming()
        {
            ns = new NetStream(nc);
            ns.client = this;
            ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
            ns.addEventListener(AsyncErrorEvent.ASYNC_ERROR, onError);
            ns.play("ovaxh37k9yep18z");
            video.attachNetStream(ns);
        }

        private function onNetStatus(event:NetStatusEvent):void
        {
            switch(event.info.code)
            {
                case 'NetConnection.Connect.Success':
                trace('NetConnection.Connect.Success');
                startStreaming();
                break;

                default:
                trace(event.info.code);
            }
        }
        private function onError(event:AsyncErrorEvent):void
        {
            trace(event);
        }
        public function onMetaData(data)
        {
            for(var i in data){ trace(i + " = " + data[i])}
            trace(video.width, video.height,stage.stageWidth,stage.stageHeight);
            video.scaleY = video.scaleX;
            video.width = stage.stageWidth
            trace(video.scaleX,video.width, video.scaleY, video.height)
            video.x = (stage.stageWidth - video.width)/2;
            video.y = (stage.stageHeight - video.height)/2;
        }
        public function onBWDone ()
        {
            trace("on Bandwidth Done ");
        }
    }
}

output

NetConnection.Connect.Success
NetStream.Play.Reset
NetStream.Play.Start
videokeyframe_frequency = 10
author =
description =
rating =
creationdate = Fri Aug 09 21:10:36 2013

width = 320
presetname = Custom
videocodecid = VP62
videodevice = ManyCam Virtual Webcam
audiocodecid = .mp3
audiodatarate = 18
audioinputvolume = 75
copyright =
title =
videodatarate = 32
framerate = 10
audiosamplerate = 11025
keywords =
audiochannels = 1
audiodevice = Microphone (Avnex Virtual Audio
height = 180
320 240 640 480
2 640 1 240

note

16:9 is stretched to width of the player but still 16:9.
it is centered.