How To Stream A Video From A Server

Question

var nc:NetConnection=new NetConnection();
nc.connect(null);
var ns:NetStream=new NetStream(nc);
ns.play("MySample.flv");
var video:Video=new Video(200,100);
video.attachNetStream(ns);
addChild(video);
video.x=200;
As seen above, I have only one idea how to take an external video file which is not in library.
My real problem is --->
If I put this swf to  a domain and put in the same domain this video also, what sholud be the link like.
There is an rtmp protocol and fms server which I have little knowledge.
Also , is a url loader or request method available for external video files to play in the swf. 
As much as I guess, there will be a change in the below null parameter, but how...
Shold I use an fms server or for short videos only a connection is enough ???
nc.connect(null);

Answer 1

I took this below code from a tutorial but opposite of this tutorial, I want the swf to take the video from the domains server where it was published from...
Not from a internet hyperlink adress, but how ?
function connect():void {
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    nc = new NetConnection();
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    nc.client = this;
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    // STEP 2
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    // note null
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    nc.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
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    nc.connect(null);
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function startVideo():void {
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    video = new Video(640, 385);
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    video.x = video.y = 20;
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    addChild(video);
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    video.attachNetStream(ns);
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    // entire url is passed into play() method
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    ns.play("http://www.mydomain.com/videos/interstingVideo.flv");
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