Architecture

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Architecture Data Management of XML-Based
Digital Video Library System

• Jacky C.K. Ma
• Michael R. Lyu

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Presentation Outline

• Introduction
• System Architecture
• Video Server
• Indexing Server
• Query Server
• Client Application
• Data Management
• Multimedia Content Description
• Multimedia Framework
• i-View Java Client
• Synchronization Manager
• Future Works

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Introduction to XDVL

• Search among a huge collection of digital video
  files
• Include process from video creation to video
  delivery, plus other features
• Adopt a multi-tier model to increase usability,
  extensibility, and reliability
• Employ XML as an open standard framework in DVL
  data management

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System Architecture

• Four primary components
• Video Server
• Indexing Server
• Query Server
• Client Applications
• Single DVL-Workstation or distributed system over
  the Internet

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Overview of a DVL System
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Digital Video Library Network
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Video Server

• Storage subsystem
• Video capturing (video conversion)
• Video segmentation and storing
• Video streaming

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Indexing Server

• Meta-data subsystem
• Extract and store video features
• Raw textual information
• Physical information
• Semantic information
• Text-based or content-based query

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Query Server

• Information portal subsystem
• Accept queries from client application
• Send optimized queries to appropriate Indexing
  Servers
• Collect and rank results
• Varies information retrieval model

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Client Application

• Presentation subsystem
• Query submission
• Query result presentation
• Video playback

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Java Applet Client
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Data Management

• Identifying and managing media content
• Enable quality access to content
• XML
• Semi-structured leads to flexibility
• Maintains interoperability
• Transparent to most networks

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Multimedia Content Description

• MPEG-7
• Proposed standard for describing the multimedia
  content
• Support both human users and automatic systems
  that process audiovisual information

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Content Descriptors

• Production Information
• Usage Information
• Physical Information
• Structural Feature
• Low Level Feature
• Conceptual Information
• Presentation Information
• References
• Interaction Information
• Form
• Conditions for accessing the material
• Classification
• Links to other relevant material
• The Context

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Multimedia Framework

• MEG-21
• A common multimedia framework
• To facilitate co-operation between different
  parties in the multimedia industry
• Includes models, rules, procedures, and content
  formats

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Elements in Multimedia Framework

• Digital Item Declaration
• Digital Item Identification and Description
• Content Handling and Usage
• Intellectual Property Management and Protection
• Terminals and Networks
• Content Representation
• Event Reporting

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i-View Java Client

• Client Application of a DVL under the VIEW
  technology
• Infrastructure components
• Communication manager
• Synchronization manager
• Media Presentation components
• Result pane
• Text search query pane
• Key frame presentation pane
• Transcription presentation pane
• Map presentation pane

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Synchronization Manager

• Provide a single point of control/dependency for
  all component operations
• Incoming XML stream will be digested and
  dispatched
• Notifies each component for the time and events
• Use Message Dispatcher and Component Registry to
  get the status and attributes of each
  presentation components
• Allow flexible plugging of presentation components

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Future Research Work

• Compare and investigate mechanisms on using XML
  in system synchronization
• Investigate the feasibility of introducing MPEG-7
  and MPEG-21 into the synchronization

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QA