arca federated access to multimedia content
DESCRIPTION
ARCA Federated Access to Multimedia Content. Extending media services. Requirements are growing beyond the live netcasting and/or streaming availability Authors want content accessed Consumers want content accessible The obvious response is the access portal The broader the better - PowerPoint PPT PresentationTRANSCRIPT
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Lyngby, May 2007Diego R. Lopez, RedIRISFrancisco Cruz, UC3MCatalin Meirosu, TERENA
JRES2005, Marseille
ARCAFederated Access to Multimedia Content
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TNC. Lyngby, May 2007
Extending media services
• Requirements are growing beyond the live netcasting and/or streaming availability
• Authors want content accessed• Consumers want content accessible• The obvious response is the access portal
The broader the better
• Simple to use Plug-and-play Plug-and-be-played
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TNC. Lyngby, May 2007
The fate of common directories
• Common directories are the usual answer to the problem of resource location in broad communities But they face data partition Formats, protocols, security (and privacy) considerations
• Participation requires a high effort Staff and/or technological And related to local visibility
The result is the continuous re-building of central repositories of data Almost automatically outdated with respect to their once local
sources Momentum decreases with time
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TNC. Lyngby, May 2007
Federating is divine
• The federated model comes into play once again• Accessing or collecting using a trusted links
And a common language for data exchange
• Maintaining total autonomy for the federated repository Policies Methods Interfaces Local visibility
• Offering a common view of information That can be enhanced for particular communities
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TNC. Lyngby, May 2007
ARCA
• “Ark” in Spanish• Agregador RSS para la Comunidad Académica
(RSS Aggregator for the Academic Community) http://arca.uc3m.es/ http://www.rediris.es/pruebas/arca/
• Main goals Harmonize and centralize all the information about available
multimedia content. Up-to-date information
• Specially, with respect to changes in each institution schedules Flexibility for participating institutions, so they can change
announcements on their own• And keep their own announcement systems
• In use by the RedIRIS community• Being currently evaluated by TERENA
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TNC. Lyngby, May 2007
The architecture
• The system is divided into channels. A channel represents a source of multimedia content
• Every institution is associated with one or more channels
• Each channel contains a series of events, retransmissions and/or multimedia contents, called “channel items”
• Each institution must generate data about its own channel, as well as data for all the items to be transmitted through the channel By means of RSS elements
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TNC. Lyngby, May 2007
On RSS
• ARCA uses RSS 2.0 as exchange format XML as markup The more widespread format for content syndication and re-
diffusion
• It allows for collecting data using off-the-shelf software (RSS aggregators)
• Validation is simple, so it is possible to guarantee that each participant is making a correct data export
• Each participant can include additional information to its RSS description without affecting system behavior
• It allows for simple extension of system functionality
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TNC. Lyngby, May 2007
RSS formats
• A general RSS format has been defined, with specific labels for each content type (direct, VoD, podcast)
• UTF-8 is required• No single RSS fulfills system requirements, so three
different namespaces are in use: Yahoo media RSS: Data about multimedia content Itunes RSS: Data about multimedia content and podcasting Google base events RSS: Announcements of programmed
events
• New namespaces can be included as the system requirements evolve
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TNC. Lyngby, May 2007
The ARCA database
• RSS descriptions are collected at well-defined endpoints
• The ARCA aggregator periodically connects and retrieves them
• The system consolidates into a single database all the information collected from the participating sources
• Through this database, information about channels and items can be accessed by means of the different ARCA search and browsing facilities
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TNC. Lyngby, May 2007
Topology
ARCA Server
Internet
RSS Cataloging/ Production Systems
Updated every N hours
Client.RSS Reader
for PDA/PPC
Client.RSS
Reader
Client.ARCAPortal
University
ResearchCenter
University
University
ResearchCenter
University
Multimedia
Servers
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TNC. Lyngby, May 2007
The ARCA portal
• Supports different search/browsing paradigms Lists of events Calendar Queries on metadata Browsing different classifications
• Searches can be constrained according to institution, type of content, categories in a classification,...
• Multilingual support Currently: Castilian, Catalan and English
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TNC. Lyngby, May 2007
The ARCA portal -II
• Offers live RSS creation for queries It is possible to subscribe to specific feeds
• Playing of all items either embedded or via external viewers
• Supports direct playing of podcasts The portal can act as an “universal podcast player”
• iTunes friendly The RSS for podcasts can be directly fed into
• Admin interface Manage data sources Manage categories
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TNC. Lyngby, May 2007
Some facts and figures
• Based on open Apache, PHP5 and MySQL• Seven institutions currently participating
Plus the biggest Spanish virtual university (UNED) that committed to join along June
• ~700 items available• Two classifications in operation
Spanish Higher Education directives UNESCO codes
• Other components available Statistics (URJC) Joomla agent (UPM) Item builder (UNICAN)
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TNC. Lyngby, May 2007
And more to come
• Dynamic endpoint definition• Ad-hoc creation for items dealing with sparse
live events at the portal• Enhanced admin interface, including detailed
statistics • Support for groups of events (courses,
workshops,...) when searching/browsing• Display of related items• Support for OMPL and (possibly) ATOM 1.0
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TNC. Lyngby, May 2007
The long awaited demo