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Use Cases and Requirements for Media Fragments

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  • misha.wolf@thomsonreuters.com
    Use Cases and Requirements for Media Fragments Raphael Troncy, Jack Jansen, Yves Lafon (et al.), W3C Technical Report W3C announced the publication of First
    Message 1 of 1 , May 9 1:05 PM
      Use Cases and Requirements for Media Fragments
      Raphael Troncy, Jack Jansen, Yves Lafon (et al.), W3C Technical Report

      W3C announced the publication of First Public Working Draft for the
      "Use Cases and Requirements for Media Fragments" specification. The
      document was produced by the Media Fragments Working Group, which is
      part of the W3C Video on the Web Activity. The mission of the Media
      Fragments Working Group is to address temporal and spatial media
      fragments in the Web using Uniform Resource Identifiers (URI). This
      specification describes use cases and requirements for the development
      of Media Fragments 1.0. It also specifies the syntax for constructing
      media fragment URIs and explains how to handle them when used over the
      HTTP protocol. Finally, it  includes a technology survey for addressing
      fragments of multimedia document (video, audio, images). From the
      'Introduction': Audio and video resources on the World Wide Web are
      currently treated as "foreign" objects, which can only be embedded
      using a plugin that is capable of decoding and interacting with the
      media resource. Specific media servers are generally required to
      provide for server-side features such as direct access to time offsets
      into a video without the need to retrieve the entire resource. Support
      for such media fragment access varies between different media formats
      and inhibits standard means of dealing with such content on the Web.
      This specification provides for a media-format independent, standard
      means of addressing media fragments on the Web using Uniform Resource
      Identifiers (URI). In the context of this document, media fragments are
      regarded along three different dimensions: temporal, spatial, and
      tracks. Further, a fragment can be marked with a name and then addressed
      through a URI using that name. The specified addressing schemes apply
      mainly to audio and video resources -- the spatial fragment addressing
      may also be used on images. The aim of the specification is to enhance
      the Web infrastructure for supporting the addressing and retrieval of
      subparts of time-based Web resources, as well as the automated
      processing of such subparts for reuse. Example uses are the sharing of
      such fragment URIs with friends via email, the automated creation of
      such fragment URIs in a search engine interface, or the annotation of
      media fragments with RDF. This specification will help make video a
      first-class citizen of the World Wide Web. The media fragment URIs
      specified in this document have been implemented and demonstrated to
      work with media resources over the HTTP and RTP/RTSP protocols. Existing
      media formats in their current representations and implementations
      provide varying degrees of support for this specification. It is
      expected that over the time, media formats, media players, Web Browsers,
      media and Web servers, as well as Web proxies will be extended to adhere
      to the full requirements given in this specification.

      See also the W3C Media Fragments Working Group: http://www.w3.org/2008/WebVideo/Fragments/
      [From XML Daily Newslink. Friday, 01 May 2009]

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