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Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
Implementing the Media Fragments URI Specification
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Implementing the Media Fragments URI Specification

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Implementing the Media Fragments URI Specification - Talk given at the Developer's Track of the 19th World Wide Web Conference (WWW'2010), Raleigh (NC), USA, April 29th 2010

Implementing the Media Fragments URI Specification - Talk given at the Developer's Track of the 19th World Wide Web Conference (WWW'2010), Raleigh (NC), USA, April 29th 2010

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  1. Implementing the Media Fragments URI Specification Raphaël Troncy <raphael.troncy@eurecom.fr>, Davy Van Deursen, Erik Mannens Silvia Pfeiffer, Yves Lafon
  2. Use Case  Aidem received on her Facebook wall a status message containing a Media Fragment URI  Use a ‘#’ !  Highlight a video sequence  Highlight a region to pay attention to 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -2
  3. Media Fragments URI Provide URI-based mechanisms for uniquely identifying fragments for media objects on the Web, such as video, audio, and images. Photo credit: Robert Freund 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -3
  4. Requirements  r01: Temporal fragments:  a clipping along the time dimension from a start to an end time that are within the duration of the media resource  r02: Spatial fragments:  a clipping of an image region, only consider rectangular regions  r03: Track fragments:  a track as exposed by a container format of the media resource  r04: Named fragments:  a media fragment - either a track, a time section, or a spatial region - that has been given a name through some sort of annotation mechanism 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -4
  5. Side Conditions  Restrict to what the container format (encapsulating the compressed media content) can express (and expose), thus no transcoding  Protocol covered: HTTP(S), FILE, RTSP, RTMP http://www.w3.org/TR/media-frags-reqs/ 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -5
  6. Media Fragments processing  General principle:  Smart UA will strip out the fragment definition and encode it into custom http headers ...  (Media) Servers will handle the request, slice the media content and serve just the fragment while old ones will serve the whole resource  Four recipes proposed 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -6
  7. Recipe 1: UA mapped byte ranges  The User Agent knows how to map a custom unit into bytes and sends a normal Range request expressed in bytes 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -7
  8. Recipe 1: UA mapped byte ranges 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -8
  9. Recipe 2: Server mapped byte ranges  The UA sends a Range request expressed in a custom unit (e.g. seconds), the server answers directly with a 206 Partial Content and indicates the mapping between bytes and the custom unit 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA -9
  10. Recipe 2: Server mapped byte ranges 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 10
  11. Recipe 3: Proxy cacheable variant  The UA sends a Range request expressed in a custom unit (e.g. seconds), the server answers first with just a Head and the mapping between the custom unit and bytes so that the UA issues another normal Range request expressed this time in bytes making the answer cacheable. 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 11
  12. Recipe 3: Proxy cacheable variant 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 12
  13. Recipe 4: Serving playable resources  The UA sends a Range request expressed in a custom unit (e.g. seconds), the server provides a multipart message body reply (multipart/byte-ranges) containing not only the bytes corresponding to requested media fragment but also the media header data making the resource playable. 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 13
  14. Recipe 4: Serving playable resources 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 14
  15. Implementation  Media Fragment server (4 recipes supported):  Ninsuna: http://ninsuna.elis.ugent.be/MediaFragmentsServer  Media Fragment user agents:  Ninsuna Flash player: http://ninsuna.elis.ugent.be/MediaFragmentsPlayer Supports recipe 1  Silvia Pfeiffer's experiment with HTML5 + JS: http://annodex.net/~silvia/itext/mediafrag.html Supports recipe 1 (for .ogg files and time dimension)  Firefox pluggin development in order to support all recipes (HTML5 + XMLHttpRequest) 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 15
  16. Issues  Communicating with the media player  HTML5 browser: patch submitted for Firefox  Flash: need to build a custom player  Media Fragments rendering  Spatial dimension?  Names/Tracks discovery  Media Multitrack (JS) API: http://www.w3.org/WAI/PF/HTML/wiki/Media_MultitrackAPI  Get involved? http://www.w3.org/TR/media-frags/ http://lists.w3.org/Archives/Public/public-media-fragment/ 29/04/2010 - Implementing the Media Fragments URI Specification - WWW 2010, Raleigh, USA - 16

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