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Silverlight video doesn't work when file is streamed from handler

I have a web site under .NET 2.0 that renders videos using the Silverlight
media player.

The web page looks like this:
<%@ Page Language="C#" AutoEventWireup ="true" CodeBehind="vid eo2.aspx.cs"
Inherits="WebAp plication2.vide o2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<form id="form1" runat="server">
<asp:ScriptMana ger ID="ScriptManag er1" runat="server">
<asp:ScriptRefe rence Path="~/script/SilverlightCont rol.js" />
<asp:ScriptRefe rence Path="~/script/SilverlightMedi a.js" />
</asp:ScriptManag er>
<div id="mp1p" />

<script type="text/javascript">
Sys.UI.Silverli ght.Control.cre ateObject('mp1p ', '\u003cobject
type="applicati on/x-silverlight" id="MediaPlayer 1"
style="height:2 40px;width:320p x;">\r\n\t\u003 ca
href="http://go2.microsoft.c om/fwlink/?LinkID=114576& v=1.0">\u003cim g
src="http://go2.microsoft.c om/fwlink/?LinkID=108181" alt="Get Microsoft
Silverlight" style="border-width:0;" />\u003c/a>\r\n\u003c/object>');
Sys.Application .initialize();
Sys.Application .add_init(funct ion()
// This works:
$create(Sys.UI. Silverlight.Med iaPlayer, { "mediaSourc e":
"video/3StrikesChipmun k_56.wmv", "scaleMode" : 1, "source":
"skins/mediaplayer/Professional.xa ml" }, null, null, $get("mp1p"));

// This does not work (only difference is that it gets the video from the
//$create(Sys.UI. Silverlight.Med iaPlayer, { "mediaSourc e":
"handler/getmediaobject. ashx", "scaleMode" : 1, "source":
"skins/mediaplayer/Professional.xa ml" }, null, null, $get("mp1p"));

This page works great when I directly reference the video file. But when I
try to use an HTTP handler instead, all I get is an empty Silverlight control
with the Play button disabled and no video. You can repro it by commenting
out the $create line above that references the WMV file and uncomment the
line below it that uses the getmediaobject. ashx handler.

The getmediaobject. ashx handler is straight forward:

using System.IO;
using System.Web;
using System.Web.Sess ionState;

namespace WebApplication2 .handler
[System.Web.Serv ices.WebService (Namespace = "http://tempuri.org/")]
[System.Web.Serv ices.WebService Binding(Conform sTo =
System.Web.Serv ices.WsiProfile s.BasicProfile1 _1)]
public class getmediaobject : IHttpHandler
#region IHttpHandler Members

public bool IsReusable
get { return true; }

public void ProcessRequest( HttpContext context)
ProcessMediaObj ect(context,
context.Server. MapPath("~/video/3StrikesChipmun k_56.wmv"));


private void ProcessMediaObj ect(HttpContext context, string filePath)
FileStream fileStream = null;
context.Respons e.Clear();
context.Respons e.ContentType = "video/x-ms-wmv";
context.Respons e.Buffer = false;

HttpCachePolicy cachePolicy = context.Respons e.Cache;
cachePolicy.Set Expires(System. DateTime.Now.Ad dSeconds(259200 0)); // 30
cachePolicy.Set Cacheability(Ht tpCacheability. Public);
cachePolicy.Set ValidUntilExpir es(true);

const int bufferSize = 32768;
byte[] buffer = new byte[bufferSize];
long byteCount;
fileStream = File.OpenRead(f ilePath);
while ((byteCount = fileStream.Read (buffer, 0, buffer.Length)) 0)
if (context.Respon se.IsClientConn ected)
context.Respons e.OutputStream. Write(buffer, 0, buffer.Length);
context.Respons e.Flush();
if (fileStream != null)
fileStream.Clos e();

context.Respons e.End();

The really odd part is that the handler *does* work on my local network - it
fails when I publish the code to a web server and then access the page
across the internet. It happens on both IIS 6 and IIS 7, and in IE and

I published the above code at
http://www.galleryserverpro.com/dev/webapp2/video2.aspx. The page is
currently configured to use the handler so that you can see it failing for

Additional info:
1. I am using the final release of 2.0 Silverlight, including the two script
files SilverlightCont rol.js and SilverlightMedi a.js.
2. I have confirmed that no exception is occuring in the handler.
3. Using Firebug I can confirm that the handler is being called and that it
is returning data to the browser.

All evidence points to Silverlight not being able to handle the data
streamed from Silverlight. Perhaps there is a change I can make to the
handler to get it to work, or maybe there is an issue within Silverlight.
Please advise.

Roger Martin
Nov 5 '08 #1
0 3601

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