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Jim · Guest

I am trying to write a player which can accept play not just UNICAST
but
also receive MULTICAST packets from the Windows 2003 Media Server.
The problem that I am having, is that I don't know how the protocol to
engage to multicast is initiated and whatelse takes places from the
beginning to end. Can somebody help me understand what and how should
I write the application to subscribe to multicast. By sniffing the
network, I was not able to follow throgh the protocol, how the
protocol works? What is the first packet that my application should
listen to or sent out? What are the following packets to receive?

Thank you,

Jim.

Neil Smith [MVP Digital M · Guest

Rather than just posting the *same* request again, why don't you read
the links in the reply I posted to you 2 days ago ?

Bye -
Neil

On 27 Sep 2004 06:07:32 -0700, shija03@hotmail.com (Jim) wrote:

Jim · Guest

Hi Neil

You sure have tought me a lesson - catching me because I posted the
same message twice. I hope you understand that when someone posts an
answer such as: "Do a search on Google and read up" it pretty much
tells me ... Nothing that I didn't know or do before.

My question is quite simple: Show communication the protocol
message exchange sequence that takes place during MULTICASTING from
beginning to end on a Microsoft Media Server at video and audio
streaming time (including the initilization of the client - windows
media player), and not the definition of MULTICASTING which is what I
think you gave me. I understand you are very good at Media matter and
I am thankful for your answer, but the reason why I am asking this
question is because GOOGLE is not always the answer (I am sure you
already know this). Please, don't take this the wrong way - perhaps
if you could point me out to the right URL rather than just a search
it would help me much more.

Regards,

Jim.

MY PREVIOUS POSTING:

"
Hello,

I am trying to write a player which can accept play not just UNICAST
but
also subscribe to MULTICAST. The problem that I am having, is that I
don't
know how the protocol to engage to multicast is initiated and whatelse
takes places from the beginning to end. Can somebody help me
understand
what and how should I write the application to subscribe to multicast.

Thank you,

Roman
Post a follow-up to this message

Message 2 in thread
From: Neil Smith [MVP Digital Media] (neil@nospam.com)
Subject: Re: Multicast Media Player

View this article only
Newsgroups: microsoft.public.windowsmedia.sdk
Date: 2004-09-25 04:30:58 PST

I don't know ;-) But probably if you read some of the links in this
search, they seem to offer excellent background information :
http://www.google.com/search?hl=en&ie=UTF-8&q=writing+applications+for+mbone+multicast

Cheers - Neil

On Sat, 25 Sep 2004 05:07:03 GMT, Roman Mon <RMon@netmon.net> wrote:

Neil Smith [MVP Digital M · Guest

OK well lets start again then : The best document I know of about the
mms protocol used for multicast is here : http://sdp.ppona.com/ look
under the 'Read a document' dropdown for 'MMS Protocol'. It's quite
dense, but basically they have sniffed the packets and determined a
great deal of what happens in an MMS session.

Next we need to determine how this fits in to a multicast environment.
There's this page which covers the basics, but you already know these:
http://www.microsoft.com/windows/windowsmedia/serve/multiwp.aspx

Generally the best source of information (though not easy to follow)
is on MSDN's website pages. There is some example code here :
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmsrvsdk/htm/wmsmulticastdatawriterpluginprops.asp
which shows how to set up a multicast server in VB.Net/C#/C++

There is a description here of the Multicast sink object's methods :
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmsrvsdk/htm/iwmsadminmulticastsinkinterface.asp

To reference your multicast server stream, you need to allow the
client to download an .nsc muticast stream descriptor file, which
tells it approximately where to look for your muticast island.

The URL format is http://computername.domain.com/broadcast.nsc
Windows media server (2003) has a wizard which allows you to create
the ASX (player playlist) and NSC (server multicast announcement)
files. I'm not sure the .nsc file format is documented, or I haven't
seen it.

The note in the documentation for WM Server 2003 states :

"Multicast streaming and the WMS Multicast Data Writer plug-in are
available only if Windows Media Services 9 Series is running on the
following editions of the operating system: Windows Server 2003,
Enterprise Edition and Windows Server 2003, Datacenter Edition. If you
are running Windows Server 2003, Standard Edition, these features are
not supported."

OK that should get you started,
Good luck - Cheers, Neil

On 28 Sep 2004 15:45:29 -0700, shija03@hotmail.com (Jim) wrote:

Jim · Guest

Neil,

Thank you very much for all the trouble.

Jim.

Jim · Guest

Neil,

Thank you very much for all the trouble.

Jim.

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