Architecture & Data Management of XML-Based Digital Video Library System

1. Architecture & Data Management of XML-Based Digital Video Library System Jacky C.K. Ma Michael R. Lyu

2. 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

3. 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

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

5. Overview of a DVL System

6. Digital Video Library Network

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

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

9. 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

10. Client Application • Presentation subsystem • Query submission • Query result presentation • Video playback

11. Java Applet Client

12. Data Management • Identifying and managing media content • Enable “quality access” to content • XML • Semi-structured leads to flexibility • Maintains interoperability • Transparent to most networks

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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. Q&A