Metadata format and Update Notification Protocol Yuji Nomura - PowerPoint PPT Presentation

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Metadata format and Update Notification Protocol Yuji Nomura Fujitsu Laboratories Ltd. Henning Schulzrinne Columbia University Background Standardization activities for electronic program guides (EPGs) MPEG-7, TV Anytime Forum, DVB,

Metadata format and Update Notification Protocol Yuji Nomura Fujitsu Laboratories Ltd. Henning Schulzrinne Columbia University
Background � Standardization activities for electronic program guides (EPGs) � MPEG-7, TV Anytime Forum, DVB, etc. � Proprietary EPGs � e.g., Cable TV, PVR � Also, protocol managing metadata
Issues � draft-nomura-mmusic-pguide- requirements-00.txt � Are requirements for EPGs appropriate? � Does existing formats meet the requirements? � Protocol to manage metadata
Requirements for Metadata � Describe features of multimedia content comprehensively: � URL, genre, rating, availability, bandwidth, billing,.. � Multiple segments in a program � Multiple metadata EPG sources
MPEG-7 � Provides description tools for multimedia content � Defines a comprehensive set of audiovisual description tools � Description Definition Language (DDL) = XML schema + some extended datatypes � Description Schema (DS) = structure, semantics � Descriptor (D) = features � DDL was standardized in Sep. 2001
TV Anytime Forum (TVA) � Uses MPEG-7 tools to describe EPGs � Describes structure of programs � Multiple programs in a program group � Multiple program locations for a program � Allows multiple EPG sources � Describes user preferences and usage history � Time, content, format, action, ...
Other Activities � DVB-IPI � iEPG � text-based straightforward description � lack of extensibility � on-demand retrieval using HTTP � Proprietary EPGs � Replay TV, TiVo
Requirements for Protocol � On-demand retrieval � Simple update notification mechanism � Managing metadata status on a server and a client � Useful for a content management in general � Delta description methods 1. defined by XML schema 2. using existing algorithm like “diff”
SIP Event Notification � draft-nomura-cdi-mmusic-mupdate-00.txt � Simple: using SUBSCRIBE and NOTIFY � Server and client can manage metadata status � Delta description � Is the protocol suitable for MMUSIC-WG? � WEBI-WG was closed � CDI-WG is focusing on requirement works

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