<videovortex> Media Fragments Working Group - Video, Audio, Images
seth.keen at rmit.edu.au
Thu Nov 19 02:50:20 CET 2009
'The mission of the Media Fragments Working Group, part of the Video
in the Web Activity, is to address temporal and spatial media
fragments in the Web using Uniform Resource Identifiers (URI).
Brief overview - Breaking up video so you can link to points in the
timeline (deep hyperlinking) enabling video to be broken up into parts.
From - Use cases and requirements for Media Fragments
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 this 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
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.
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