The title does say it all, you have done something wrong with your code, show the code get an answer.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:containers="ws.tink.flex.containers.*" layout="vertical" verticalAlign="top"
horizontalAlign="center" backgroundGradientColors="[0x000000,0x323232]" paddingTop="0" viewSourceURL="srcview/index.html" >
There's the code...
Why would it play a video, just because it's in the src folder?
Most likely cuase is the html you are calling from the browser has nothing to do with the swf created from the source you provided. You need a video player in your app for it to play videos....