David Bristol's Media blog

From Windows Media to IIS Media Services to Azure Media Services I'll have tips and tricks for each of these.

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  • Blog Post: Why you see packet fragments with WMS multicast

    First a bit of terminology that will help keep things clear. For the purposes of this discussion I will use the term packet to mean an audio/video unit of data. Specifically this is an ASF packet based on the ASF file specification which includes WMA and WMV. When I refer to a frame , I’m talking...
  • Blog Post: Getting Windows Media Load Simulator to work on modern operating systems

    The Windows Media Load Simulator (occasionally abbreviated as 'loadsim') tool was created to help stress test Windows Media Services (WMS) servers. Since WMS does live streaming and uses application specific control messages over RTSP and HTTP using a web server stress tool doesn't really work. Also...
  • Blog Post: Causes of 408's in a Windows Media Services log

    One common question I get from Windows Media Services admins who have looked through their log files is about the cause of the 408 status codes. Before answering the question directly, I need to define what a 408 is. Simply put, it is an abnormal disconnect. All it means is that at some point during...
  • Blog Post: Using HTTP Referer to prevent deep linking to a WMS server

    For a number of years now I've had customers ask me about how to prevent deep linking from random people directly to their Windows Media server. Deep linking is described on http://en.wikipedia.org/wiki/Deep_linking . Often this occurs when a web site owner does not ask for permission to point an embedded...
  • Blog Post: Using Windows Media Services 2008 Cache/Proxy plug-in

    One of the main differences between Windows Media Services 9.1 on Windows 2003 and WMS 2008 on Windows Server 2008 is the inclusion of the Cache/Proxy plug-in. In WMS 9.1 you had to compile (and write some of your own code to do caching) to have cache/proxy functionality. WMS 9.1 also required that use...
  • Blog Post: WMP unable to connect to WMS 2008; WMS returning 503 Service Unavailable

    I've talked to a number of people that are having problems streaming from Windows Media Services 2008 on Windows Server 2008 when the server is behind a NAT firewall, some proxies, or load balancers. Clients on the internal network work just fine. In a network trace you'll see at WMS is returning a 503...
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