<videovortex> Media Fragments Working Group - Video, Audio, Images

Seth Keen 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  
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.

Seth Keen
media lecturer
 >> sethkeen.net/blog

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