Flash compiled with Flex SDK very big file size - actionscript-3

Question

I had a simple flash video player I was compiling using Adobe Flash Builder , but now I am compiling it using Flex SDK 4.6 . Flash filesize was 20KB when I was compiling with FB . Now it's 280KB . I know that it adds some swc files to swf build , I have disabled debug etc instructions provided here http://livedocs.adobe.com/flex/3/html/help.html?content=performance_06.html . Is it possible to somehow convert fla components without using mxml ?
Here is my mxml code
<?xml version="1.0" encoding="utf-8"?>
<mx:Application backgroundColor="#000000" xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" layout="absolute" minWidth="320" minHeight="240" creationComplete="initApp()">
<fx:Script>
public function initApp():void{
var p = new video_player(uic);
}
</fx:Script>
<mx:UIComponent id="uic" />
</mx:Application>
video_player.as
....Import statements
public class video_player{
private var uic:UIComponent
var fullScreen:Image;
var rtmpApplication:String;
var streamName:String;
public function video_player(_uic:UIComponent) {
uic=_uic;
if (FlexGlobals.topLevelApplication.parameters.hasOwnProperty("applicationName")) {
rtmpApplication=FlexGlobals.topLevelApplication.parameters.applicationName;
}
if (FlexGlobals.topLevelApplication.parameters.hasOwnProperty("streamName")) {
streamName=FlexGlobals.topLevelApplication.parameters.streamName;
}
vPlayer=new Video(playerwidth,playerheight);
uic.addChild(vPlayer);
init();
}
public function init(){
//add fullscreen image in flash top right , and event handler
//Code to connect to live application and play video using NetConnection and NetStream
}
}
Is there any way around this?

Answer 1

Also I have added option -static-link-runtime-shared-libraries=true so it wont download anything runtime . Without that flash size is 49KB
By setting the above option, you have told the compiler to include all of the Flex framework classes (that are used by your application) in the application SWF. So your SWF grows from 49KB to 280KB.
This is the "RSL" thing (runtime shared library) that #Reboog711 and I were talking about. If you use the Flex RSL's, then all of that Flex framework code is not included in your application SWF. The Flex framework RSL's are signed by Adobe and can be cached by the Flash Player. So using them is always preferable. (Note: I'm assuming this all still works with Apache Flex)
Finally, I wish to reiterate that in Flash Builder there are two basic kind of projects you can create: Flex project, Actionscript project. I'm ignoring the mobile options, but the same applies to them:
An Actionscript project will, in general, result in a smaller SWF because you are not relying on any of the Flex framework classes. It sounds like you could make your video player app even smaller (closer to the 20KB size you originally had) if you were to create an Actionscript project.