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Metadata format and Update Notification Protocol

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

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Metadata format and Update Notification Protocol

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  1. Metadata format andUpdate Notification Protocol Yuji Nomura Fujitsu Laboratories Ltd. Henning Schulzrinne Columbia University

  2. 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

  3. Issues • draft-nomura-mmusic-pguide-requirements-00.txt • Are requirements for EPGs appropriate? • Does existing formats meet the requirements? • Protocol to manage metadata

  4. Requirements for Metadata • Describe features of multimedia content comprehensively: • URL, genre, rating, availability, bandwidth, billing,.. • Multiple segments in a program • Multiple metadata EPG sources

  5. 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

  6. 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, ...

  7. Other Activities • DVB-IPI • iEPG • text-based straightforward description • lack of extensibility • on-demand retrieval using HTTP • Proprietary EPGs • Replay TV, TiVo

  8. 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 • defined by XML schema • using existing algorithm like “diff”

  9. 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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