OPERA Technical Workshop 07 July 2000

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OPERA Technical Workshop 07 July 2000

• Case Study Applying OPERA
• Seven Steps to OPERA

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Case Study Applying OPERA
External Player Mode
Embedded Player Mode
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Seven Steps to OPERA

• System Requirements
• Basic MNS Configuration
• Determine the Video Server Policy
• Building Redirection Criteria
• Setting Up CMS to Control Content Replication
• Using the OPERA Module to Customize the Web
  Output
• Managing Multimedia Content by CMA

MNS
CMS
CMA
OPERAscript
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System Requirements
WWW
Video
MNS
CMA
CMS
Internet Service Provider
Internet Content Provider
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System Requirements

• Multimedia Name Server (MNS)
• Developed in C
• SUN SPARC Solaris 2.6 later
• Basic Memory 64MB
• UMRL 5KB
• Virtual Host 20KB
• Disk Storage 5MB

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System Requirements

• Content Management System (CMS)
• Developed in Java
• SUN SPARC Solaris 2.6 or later
• Basic Memory 64MB
• Disk Storage
• System 5MB
• Temporary Storage Depends on Content Size

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System Requirements

• Content Management Agent (CMA)
• Developed in C
• MS Windows 98 2000 / C
• Basic Memory 32MB
• Disk Storage 5MB

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CUHK Demo Site

• Video Server Information
• Server Type and Host Name
• operareal.hkcl.org Real Server
• operamedia.hkcl.org MediaService Server
• qtss.hkcl.org QuickTime Server
• Redirection Criteria
• Client Network Location,
• Player, Language and Bit-rate
• Multimedia Name Server
• Domain and Host Name
• hkcl.org / beta2.hkcl.org

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Basic MNS Configuration

• UMRL Format
• http//beta2.hkcl.org8008/understanding_cuhk.umrl
  
• Virtual Host
• One MNS can serves multiple domains using virtual
  hosting
• /conf/mns_config_file

MNS Host Name
Port
UMRL Path
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Determine the Video Server Policy

• Specify which server to serve client requests
  from a particular network
• Configure the network mapping group
• Form server groups to increase the throughput
• Configure the server group

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Network Mapping Group
Hong Kong group 1 ip 202.0.77.0/24 ip
202.0.78.0/24
Taiwan group 2 ip 202.2.52.0/22 ip
202.5.224.0/19
Route IP Address/Bitmask Client IP
Address Server Group Number
Singapore group 3 ip 202.0.71.0/24 ip
202.0.88.0/23
group 0 is special If no match for IP The default
group number is 0
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Server Group
server_name operareal.hkcl.org server_group
0 server_group 1 server_group 2
Hong Kong Group 1
server_name operamedia.hkcl.org server_group
0 server_group 2 server_group 3
operareal.hkcl.org
qtss.hkcl.org
Taiwan Group 2
Singapore Group 3
server_name qtss.hkcl.org server_group
0 server_group 1 server_group 3
operamedia.hkcl.org
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Load Balancing

• Round Robin Load Balancing is the default which
  applies on the servers within the same group and
  having the required content
• Other Load Balancing Algorithm is coming.

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Building Redirection Criteria

• Two Types of Criteria
• System Criteria
• Determined by System
• Clients cannot specify their preferences directly
• e.g. Network and Server Group
• Personal Criteria
• Clients can choose their personal choices

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Building Redirection Criteria

• Two Types of Personal Criteria
• Pre-defined Criteria
• Player Real, WindowsMedia and QuickTime
• Multiple Selections with order
• Custom Criteria
• Single Selection
• e.g. Language and Bandwidth

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Building Redirection Criteria

• Criteria Matching Order
• For the Personal Criteria, the order of criteria
  defined is used
• For the Custom Criteria, the order of criteria
  value defined is used
• For the Pre-define Criteria, the client
  preference order is used

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Criteria Matching Tree
criteria Player 0 Real 1 MediaService 2
QuickTime
criteria Language 0 Cantonese 1 Putonghua 2
English
Network
Real
MS
criteria Bandwidth 0 45Mbps 1 1.5Mbps 2
512Kbps 3 256Kbps 4 128Kbps 5 56Kbps 6
28.8Kbps
English
English
Cantonese
1.5Mbps
512Kbps
256Kbps
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Setting Up CMS to Control Content Replication

• Acting as a staging server to receive physical
  files from CMA with user authentication
• Replicating the physical files to video servers
  with bit-rate control to avoid overfeeding
• Replication according to media type
• Scheduled file upload available soon
• Updating MNS for latest changes

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Setting Up CMS to Control Content Replication

• CMA User
• username, password, virtual host, list of video
  servers
• Video Server
• Hostname, directory path, mediatype, video
  format, file upload maximum bit-rate
• MNS
• Virtual host, username, password, CMS port number

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Using the OPERAscript to Customize the Web Output

• OPERAscript consists of two HTML script libraries
  
• Javascript opera.js, VBscript opera.vbs
• HTML formatting and Automatic Player Detection
• Web output
• A set of web pages called CGI Group can be
  specified per UMRL via CMA

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Web Output Types and Attributes

• 4 Kinds of Web Output Types
• Setup Page
• External Player Page
• Embedded Player Page
• Not Found Page
• 2 Types of Web Output Attributes
• Popup New window
• Window Width and Height

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Setup Page

• Client can select their personal choices
• Automatic Player Detection

OPERA_Pref()
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External Player Page
OPERA_PrintCriteriaValue("Player")
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Embedded Player Page
OPERA_EmbedPlayer()
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Not Found Page
OPERA_PrintCriteriaValue("umrl")