Radvision videoconference streamingsolutionscookbook

Videoconference Streaming
Solutions
Cookbook

NOTICE

© 2002 RADVISION Ltd. All intellectual property rights in this publication are owned by
RADVISION Ltd. and are protected by United States copyright laws, other applicable copyright laws
and international treaty provisions. RADVISION Ltd. retains all rights not expressly granted.
No part of this publication may be reproduced in any form whatsoever or used to make any
derivative work without prior written approval by RADVISION Ltd.
No representation of warranties for fitness for any purpose other than what is specifically mentioned
in this guide is made either by RADVISION Ltd. or its agents.
RADVISION Ltd. reserves the right to revise this publication and make changes without obligation to
notify any person of such revisions or changes. RADVISION Ltd. may make improvements or
changes in the product(s) and/or the program(s) described in this documentation at any time.
If there is any software on removable media described in this publication, it is furnished under a
license agreement included with the product as a separate document. If you are unable to locate a
copy, please contact RADVISION Ltd. and a copy will be provided to you.
Unless otherwise indicated, RADVISION registered trademarks are registered in the United States
and other territories. All registered trademarks recognized.

For further information contact RADVISION or your local distributor or reseller.

Video Streaming Solutions Cookbook version 1.0, November, 2002
Publication 1
http://www.radvision.com

CONTENTS

1 Introduction
What’s in this Chapter 1
What is Videoconference Streaming? 1
Benefits of Videoconference Streaming 3
Application Ideas 3
Glossary of Terms 3

2 Homemade Solution
What’s in this Chapter 5
About the Homemade Solution 6
How it Works 6
Benefits 8
Limitations 9
Software Requirements 9
Hardware Requirements 9
Prerequisites 9
Implementation Overview 9
Installing Windows Media Software 10
Configuring Windows Media Encoder 11
Configuring Windows Media Administrator 18
Configuring a Broadcast in the Media Administrator 18
Configuring an On-demand Stream in the Media Administrator 25
Connecting an Endpoint to a Video Stream 31
Links for More Information 31

Contents iii

1
INTRODUCTION

WHAT’S IN THIS This chapter provides an introduction to videoconference streaming, including
CHAPTER the following:
What is Videoconference Streaming?
Benefits of Videoconference Streaming
Application Ideas
Glossary of Terms

Note Currently RADVISION recommends the Homemade solution for streaming
during a video conference. The Homemade Solution chapter describes the
Homemade solution and how to set it up to work with RADVISION network
devices.

WHAT IS Streaming in the context of a videoconference means broadcasting a
VIDEOCONFERENCE point-to-point or multipoint videoconference to an audience of listeners and
STREAMING? viewers who are not active participants in the conference. The audience can
listen to and/or watch the conference on a client (typically a PC) while sitting at
their desks.
During the conference, a streaming server located in the videoconference
network receives the same video streams as participants and sends these streams
to the clients connected to it. The clients require only a media-playing
application such as Real RealMedia, Microsoft Windows Media Player or Apple
QuickTime.

Introduction 1

What is Videoconference Streaming?

An example of a network with a streaming server is shown in Figure 1-1. Three
videoconference terminals, an MCU and a streaming server are registered to a
gatekeeper. The terminals and the streaming server participate in a conference
managed by the MCU. Three PCs with media-playing software are connected to
the streaming server.

videoconference videoconference
terminal terminal

MCU and
Gatekeeper

streaming server

iMac iMac iMac

desktop PCs

Figure 1-1 A Videoconference with Streaming

2 Videoconference Streaming Solutions Cookbook

Benefits of Videoconference Streaming

BENEFITS OF Videoconference streaming provides an efficient and economical way of
VIDEOCONFERENCE sending live information to a large audience in real time. Members of the
STREAMING audience can view the conference from the PC on their desks without the need to
add any special devices such as video cameras, microphones or video capture
cards.
In a regular videoconference you require both processing and network
resources. The load on resources increases with each additional participant.
Streaming is an excellent alternative for when some of the participants do not
need to actively participate in a discussion, but simply need to listen in and view
what is happening. The load on the network is reduced because the streaming is
uni-directional. The processing load on the MCU is reduced as there is no need
to process incoming media data from the passive participants.

APPLICATION IDEAS Besides enabling a larger audience of passive participants to view an ongoing
videoconference, streaming is useful for:
Company-wide broadcasts where everyone views the broadcast
at their desks
Distance learning
Telemedecine
Demonstrating products to a widespread audience
Sharing a debate or discussion
Recording for video on demand

GLOSSARY OF The following terms relate to streaming in the context of videoconferencing:
TERMS
Real-time streaming
Delivery of a real-time stream of a live videoconference while the conference is
in progress.

Introduction 3

Glossary of Terms

Broadcast
Transmission of data to everybody on the network or network segment.

IP multicast
Simultaneous transmission of data from a server to a group of selected users on
a TCP/IP network (internal, intranet or Internet). IP multicast is used for
streaming audio and video over the network. The files are transmitted as one
data stream over the backbone and split to the target stations by the router only
at the end of the path.

Multi-unicast
Transmission of duplicate data streams, one to each user. In multi-unicast,
multiple users request the same data from the same server at the same time.

Video on Demand streaming
Delivery of a Video on Demand stream to a viewer upon request at any given
time. Contrast this to a real-time stream that is delivered when the conference is
in progress. The Video on Demand content is stored on a server and then
streamed to a user upon request. If the streaming server has the capability to
capture and archive a conference, a videoconference can be archived and sent
later as a Video on Demand stream.


2
HOMEMADE SOLUTION

WHAT’S IN THIS This chapter provides a description of the Homemade videoconference
CHAPTER streaming solution, including the following:
About the Homemade Solution
How it Works
Benefits
Limitations
Software Requirements
Hardware Requirements
Prerequisites
Implementation Overview
Installing Windows Media Software
Configuring Windows Media Encoder
Configuring Windows Media Administrator
Links for More Information

Homemade Solution 5

About the Homemade Solution

ABOUT THE The Homemade solution enables you to create your own streaming server. This
HOMEMADE server is then connected to the conference network. One of the participating
SOLUTION endpoints sends a video stream of the conference to the streaming server. The
streaming server compresses the stream using a codec such as H.263, H.261 or
MPEG.
An example of a network with the Homemade solution is shown in Figure 2-1
on page 8. Four videoconference terminals and an MCU are registered to a
gatekeeper. One of the terminals is a room system with a video cable
connection. A streaming server with a video capture card has a video connection
via the video cable to the room system. Three clients with media-playing
software are connected to the streaming server.
The following occurs during the conference:
1. The three terminals participate in a conference managed by the
MCU.
2. A fourth terminal sends a video stream that it has received
from the MCU to the streaming server.
3. The encoder in the streaming server processes the video
stream.
4. The streaming server sends three processed video streams, one
to each client.
5. The media player at each client plays the video stream to the
passive participants.

HOW IT WORKS This section describes how the Homemade solution interacts with the
RADVISION MCU to provide video conference streaming.
The MCU manages a video conference between a number of
participating videoconferencing endpoints.
The MCU also sends the H.323 video and audio stream to an
additional videoconferencing terminal.

Note The additional terminal must be equipped with outputs for
both voice and video.


How it Works

The additional videoconferencing terminal does not participate
in the videoconference, but instead receives the H.323 traffic
coming from the MCU and sends an analog video stream to the
computer. The terminal is connected to the computer via a video
cable.
The computer acts as a video streaming server. Installed on the
computer are the following:
A video capture card—Hardware which receives
analog video signals and converts then into digital
video streams.
Windows Media Encoder—A software application
that operates the video capture card.
Windows Media Administrator—A media server
software application that can play video streams as
real-time broadcasts, or save video on file and supply
the video stream on demand.
When the streaming server receives analog video signals from
the videoconferencing terminal, the Windows Media Encoder
instructs the video capture card to convert the signals into a
digital video stream.
Using the Windows Media Administrator, the digital video
stream can be broadcast across IP networks, saved to a file and
supplied to endpoints when requested, or both.
Streaming clients with media players can receive the broadcast
in real time or can download a specific video file from the
Windows Media Encoder.
Clients can access the required material via the Windows Media
Encoder URL, or by accessing the URL of a specified
publishing point on the Windows Media Administrator. For
more information about publishing points, see Configuring
Windows Media Administrator on page 18.

Homemade Solution 7

Benefits

videoconference videoconference
terminal terminal

viaIP MCU and
Gatekeeper
H.323

videoconference terminal (with
audio and video output)

analog video signal
Video cable

streaming server with:
Windows Media Administrator
Windows Media Encoder
video capture card

digital video streams

iMac iMac iMac

streaming clients
(with media players)

Figure 2-1 Streaming with the Homemade Solution

BENEFITS The solution has the following benefits:
A full functional streaming solution can be implemented
immediately.
Off-the-shelf equipment can be used.
Set up cost is low.


Limitations

LIMITATIONS The solution has the following limitations:
The system may be cumbersome to manage.
Only one conference can be streamed per streaming server.

SOFTWARE Windows 2000 Server
REQUIREMENTS Windows Media Administrator
Windows Media Encoder version 7.01

HARDWARE Pentium III at 500 MHz with 128 MB memory.
REQUIREMENTS A hard disk large enough for the length of video material you
wish to store.
A video capture card that supports the MPEG-1 and MPEG-2
formats.
All H.323 endpoints must support voice and video traffic.

PREREQUISITES A media player must be installed on each client.
The media player and streaming server must be compatible.
The terminal connected to the streaming server must be
connected via a video cable.
The following must be installed on the streaming server:
Windows Media Administrator.
Windows Media Encoder version 7.01.
A video capture card (RADVISION uses the AVerTV
card from AVerMedia).

IMPLEMENTATION The implementation of the Homemade solution involves the following steps,
OVERVIEW each of which are described below.

Homemade Solution 9


INSTALLING This section describes how to install the Windows Media Administrator and the
WINDOWS MEDIA Windows Media Encoder software.
SOFTWARE
Note You must install Windows Media Administrator on the Windows 2000
Server operating system only.

Both Windows Media applications are installed at the same time using the
following procedure:

To install Windows Media Administrator and Windows Media Encoder

1. From the Start menu of your computer, select Settings |
Control Panel | Add/Remove Programs.
2. Click Add/Remove Windows Components.
The Windows Components Wizard dialog box displays.

Figure 2-2 Windows Components Wizard Dialog Box

3. Check the Windows Media Services checkbox, click Next
and complete the installation according to the instructions in
the wizard.



CONFIGURING This section describes how to configure the Windows Media Encoder software.
WINDOWS MEDIA
ENCODER
To configure Windows Media Encoder

1. From the Start menu of your computer, select Programs |
Administrative Tools | Windows Media | Windows Media
Encoder.
The Welcome to Windows Media Encoder dialog box
displays.

Figure 2-3 Welcome to Windows Media Encoder Dialog
Box

2. Select Broadcast, capture or convert a file using the New
Session Wizard and click OK.
The New Session Wizard Session Selection dialog box
displays.

Homemade Solution 11


Figure 2-4 New Session Wizard Session Selection Dialog
Box

3. Select Broadcast a live event form attached devices or
computer screen and click Next.
The New Session Wizard Device Options dialog box displays.



Figure 2-5 New Session Wizard Device Options Dialog Box

4. Check the Video checkbox and select Conexant Capture from
the drop-down list.

Note The Conexant Capture setting enables the Windows Media
Encoder to work with the AVerTV video capture card.

5. Click Configure.
The Conexant Capture Properties dialog box displays.



Figure 2-6 Conexant Capture Properties Dialog Box

6. In the Video Decoder tab, select a PAL setting from the Video
Standard drop-down list. Click OK and then Next.
The New Session Wizard Broadcast Connection dialog box
displays.

Figure 2-7 New Session Wizard Broadcast Connection
Dialog Box



7. Set the HTTP port field to 8080.
The URL for Internet connections field displays the external
IP address and port of the computer on which the Windows
Media software is installed.
The URL for LAN connections field displays the internal IP
address (or name) and port of the computer on which the
Windows Media software is installed.
8. Click Next.
The New Session Wizard Profile selection dialog box
displays.

Figure 2-8 New Session Wizard Profile Selection Dialog
Box

9. From the What profile do you want to use? drop-down list,
select WM8 Video for DSL/Cable Delivery (250Kbps,
320x240, 30fps).
This setting tells the video capture card to convert the incoming
analog signal to a digital video stream at a bandwidth of
250 Kbps, with resolution of 320x240 dpi, and at a refresh rate
of 30 frames per second.



10. Click Next.
The New Session Wizard Archive Option dialog box displays.

Figure 2-9 New Session Wizard Archive Option Dialog Box

11. Click Browse and navigate to the location at which you want
to save a copy of the broadcast, then click Next.
The New Session Wizard Settings Review screen displays.

Figure 2-10 New Session Wizard Settings Review Screen



12. Check that all the settings displayed are configured as you
require, and click Finish to complete the configuration.
The Windows Media Encoder interface displays.

Figure 2-11 Windows Media Encoder Interface



CONFIGURING This section describes how to configure the Windows Media Administrator
WINDOWS MEDIA software to play video streams as real-time broadcasts, and to supply a video
ADMINISTRATOR stream on demand.

CONFIGURING A This section describes the procedure for configuring the Windows Media
BROADCAST IN THE Administrator to broadcast a video stream.
MEDIA ADMINISTRATOR

To configure Windows Media Administrator to broadcast

Administrative Tools| Windows Media | Windows Media
Administrator.
The Windows Media Administrator configuration interface
displays.

Figure 2-12 Windows Media Administrator Configuration
Interface

2. In the left-hand sidebar, select Unicast Publishing Points.
3. In the Broadcast Unicast Publishing Points section, click the
Broadcast button and select New from the drop-down list.



The QuickStart Wizard displays.
4. Click Next.
The QuickStart Wizard Select a publishing point dialog box
displays.

Figure 2-13 QuickStart Wizard Select a Publishing Point
Dialog Box

5. Select Create a broadcast publishing point and click Next.
The QuickStart Wizard Specify source dialog box displays.



Figure 2-14 QuickStart Wizard Specify Source Dialog Box

Note To modify an existing broadcast publishing point, select the Select existing
broadcast publishing point option in the QuickStart Wizard Select a
publishing point dialog box. For more information, see Modifying Broadcast
Publishing Points on page 24.

6. Select Windows Media Encoder and click Next.
The QuickStart Wizard New broadcast publishing point to
a Windows Media Encoder dialog box displays.



Figure 2-15 QuickStart Wizard New Broadcast Publishing
Point to a Windows Media Encoder Dialog Box

7. In the Alias field, type an alias for the new broadcasting point.
8. In the Path field, type the path to the Windows Media Encoder
installed on your computer using the internal URL displayed in
the URL for LAN connections field in Figure 2-7 on page 14.
9. In the Port field, type the port through which the Windows
Media Encoder sends the video stream. Then click Next.
The QuickStart Wizard Select publishing method dialog box
displays.



Figure 2-16 QuickStart Wizard Select Publishing Method
Dialog Box

10. Select the MMS protocol option and check Create an .asx file
that points to the ASX stream. Then click Next.
The QuickStart Wizard Ready to publish dialog box
displays.



Figure 2-17 QuickStart Wizard Ready to Publish Dialog Box

11. Click Finish.
The Save .asx file dialog box displays.
12. Type the name you wish to give to the file and navigate to the
location at which you wish to save the file, then click Save.
The QuickStart Wizard Publishing complete dialog box
displays.
13. Click Close to complete the configuration and to return to the
Windows Media Administrator interface.



MODIFYING BROADCAST This section describes the procedure for modifying an existing entry in the
PUBLISHING POINTS Broadcast Unicast Publishing Points section of the Windows Media
Administrator.

To modify an existing publishing point

1. Double click an entry in the Broadcast Unicast Publishing
Points section.
The Specify an alias and path for a new broadcast
publishing point dialog box displays.

Figure 2-18 Specify an Alias and Path for a New Broadcast
Publishing Point Dialog Box

2. Modify any of the settings as required and click OK.

Note The Windows Media Administrator allows you to build an
hierarchy of directories.

3. The Windows Media Administrator interface displays. The
modified entry appears in the Broadcast Unicast Publishing
Points section.



CONFIGURING AN This section describes the procedure for configuring the Windows Media
ON-DEMAND STREAM Administrator to supply a video stream on demand.
IN THE MEDIA
ADMINISTRATOR

To configure Windows Media Administrator to supply video on demand

Administrative Tools| Windows Media | Windows Media
Administrator.
displays (Figure 2-12 on page 18).
2. In the left-hand sidebar, select Unicast Publishing Points.
3. In the On-Demand Unicast Publishing Points section, click
the On-Demand button and select New from the drop-down
list.
The QuickStart Wizard displays.
4. Click Next.
The QuickStart Wizard Select a publishing point dialog box
displays.

Figure 2-19 QuickStart Wizard Select a Publishing Point
Dialog Box



5. Select Create a publishing point and click Next.
The QuickStart Wizard Create a new publishing point
dialog box displays.

Figure 2-20 QuickStart Wizard Create a New Publishing
Point Dialog Box

6. In the Alias field, type an alias for the new broadcasting point.
7. Click Browse and navigate to the location at which you want
to save the video file, then click Next.
The QuickStart Wizard Locate target .asf file dialog box
displays.



Figure 2-21 QuickStart Wizard Locate Target .asf File Dialog
Box

Note To modify an existing on-demand publishing point, select the Select
existing publishing point option in the QuickStart Wizard Select a publishing
point dialog box. For more information, see Modifying On-demand Publishing
Points on page 30.

8. Click Browse and navigate to the location from which you
want to publish the video file, then click Next.
The QuickStart Wizard Select publishing method dialog box
displays.



Figure 2-22 QuickStart Wizard Select Publishing Method
Dialog Box

9. Select the MMS protocol option and check Create an .asx file
that points to the ASX stream. Then click Next.
The QuickStart Wizard Ready to publish dialog box
displays.



Figure 2-23 QuickStart Wizard Ready to Publish Dialog Box

10. Click Finish.
The Save .asx file dialog box displays.
11. Type the name you wish to give to the file and navigate to the
location at which you wish to save the file, then click Save.
The QuickStart Wizard Publishing complete dialog box
displays.
12. Click Close to complete the configuration and to return to the
Windows Media Administrator interface.



MODIFYING ON-DEMAND This section describes the procedure for modifying an existing entry in the
PUBLISHING POINTS On-Demand Unicast Publishing Points section of the Windows Media
Administrator.

To modify an existing publishing point

1. Double click an entry in the On-Demand Unicast Publishing
Points section.
The Specify an alias and path below dialog box displays.

Figure 2-24 Specify an Alias and Path Below Dialog Box

2. In the Type option, select Home.
3. In the Directory path field, click Browse and navigate to the
directory containing the required video file. The directory must


Links for More Information

be on the same computer as the Windows Media
Administrator. Then click OK.

Note The Windows Media Administrator allows you to build an
hierarchy of directories.

displays. The new entry appears in the On-Demand Unicast
Publishing Points section.

CONNECTING AN This section describes how you configure a streaming client to Windows Media
ENDPOINT TO A VIDEO Encoder in order to access a broadcast or an on-demand video stream.
STREAM

To connect to the broadcast stream

1. From the Start menu of the streaming client, select Programs |
Accessories | Entertainment | Windows Media Player.
The Windows Media Player displays.
2. From the File menu, select Open.
The Open dialog box displays.
3. Type the name of the required media server followed by the
name of the required video file. For example,
mms://L6/andy1

LINKS FOR MORE For more information about the Windows Media Administrator, see
INFORMATION http://msdn.microsoft.com/archive/default.asp?url=/ARCHIVE/en-us/dnarwmt/
html/tvlive_server.asp.
For more information about the Windows Media Encoder, see
http://www.microsoft.com/technet/treeview/default.asp?url=/TechNet/
prodtechnol/netshow/evaluate/wencoder.asp.
For more information about videoconference streaming solutions, see
www.starbak.com.


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