Architecture of a Video Web Experience with Annodex W 3 C Video Workshop Silvia Pfeiffer Dec 2007 Annodex Association, Xiph. Org, Vquence (originally: CSIRO)
Aim Make video an integral part of the Web Everyone can author Everyone can implement tools Existing Web developers can apply their knowledge to video (e. g. URI, HTTP, CSS, Javascript) - not re-invent existing Web functionality Imagine a Web consisting only of video
Requirements Deep Linking: timed URIs Metadata: Time-aligned annotations & tags Searchability: Searching media using text Dynamic composition of video mashups Discoverability: Hyperlinking from inside media to other Web resources Share-ability: Integrated handling of metadata with the content Personalisation: Dynamic composition of media web content
The Technical Components CMML: Continuous Media Markup-Language, the HTML of time-continuous data, which allows to markup media Annodex: Annotated and Indexed Time. Continuous Data Container, which allows synchronised and interleaved exchange of CMML and multi-track binary data over networks Hyperlinks into Annodex/CMML: temporal offsets & named clips, which allows direct addressing of information inside media using URLs
The Technical Components Search Engine CMML Web Server URI CMML Annodex URI Browser Annodex URI Future IP-based Consumer Media
CMML example <cmml> <stream basetime=“ 0” utc=“ 20040114 T 153500. 00 Z”> <import src=“galaxies. ogg” contenttype=“video/ogg" start=“npt: 0"/> </stream> <head> <title>Hidden Galaxies</title> <meta name="author" content="CSIRO"/> </head> <clip id=“finding. Galaxies” start=“ 15”> <a href=“http: //www. aao. gov. au/galaxies. anx? id=radio”>Related video on Detection of Galaxies</a> <img src=“galaxy. jpg”/> <desc>What’s out there? </desc> <meta name=“KEYWORDS" content=“Radio Telescope, Galaxies"/> </clip> </cmml>
Authoring Annodex from CMML and media continuous media file CMML file Merger Annodex file
Conceptual Annodex File active head anchor Annodexed media galaxies. ogg head <head> <title> Hidden Galaxies </title> <meta name="author" content="CSIRO"/> </head> media anchor <clip id=“finding. Galaxies"> <a href=“http: //www. aao. gov. au/> Related video on Detection of Galaxies"</a> <img src=”galaxy. jpg”/> <desc>What’s out there? </desc> <meta name=“KEYWORDS" content=“Astronomy, Radio Telescope, Galaxies"/> </a> timebase=0 media start=15
CMML: i 18 n <? xml version="1. 0" encoding="UTF-8" standalone="yes"? > <!DOCTYPE cmml SYSTEM "cmml. dtd"> <cmml lang="pl"> <head lang="en"> <title>Types of fish</title> <meta name="Producer" content="Joe Ordinary"/> <meta name="DC. Author" content="Joe's friend"/> </head> <clip lang="de" id="intro" start="npt: 0"> <a href="http: //www. blah. au/fish. html">Lesen Sie mehr ü ber Fische. </a> <desc lang="en">This is the introduction to the film Joe made about fish. </desc> </clip> <clip lang="en" id="goldfish" start="npt: 5: 5. 9"> <a href="http: //www. blah. au/morefish. anx? id=goldfish">More video clips on goldfish. </a> <img src="http: //www. blah. au/goldfish. jpg"/> <desc>Joe has a fishtank at home with many colourful fish. </desc> <meta name="Subject" content="goldfish"/> <meta lang="fr" name="sujet" content="poisson d'or"/> </clip> </cmml>
CMML: multiple annotation tracks “track” attribute of clips allows grouping into multiple annotation tracks: <clip track="authors" start="npt: 0"> <a href="http: //www. blah. au/joe. html">Go to Joe’s home page. </a> <desc>Joe recorded and edited this part of the film. </desc> </clip> <clip track="default" start="npt: 0"> <a href="http: //www. blah. au/fish. html">Read more about fish. </a> <desc>This is the introduction to the film Joe made about fish. </desc> </clip> <clip track=”authors" start="npt: 3. 5"> <a href=”http: //www. blah. au/claudine. html”>Got to Claudine’s home page. </a> <desc>Claudine recorded this bit of the film. </desc> <meta name="Author" content="Claudine"/> </clip>
A multi-track Annodex file continuous media files CMML file Theora. . . Merger (anxenc) Vorbis Annodex file Theora Vorbis
Surfing Video A Firefox Web Browser extension allows streaming of videos. The components are: • A clip table to allow direct access to the sections of the video. • Free text annotation per video clip. • A hyperlink per video clip. • A data display section (for the video itself).
Searching video Using keyword search. Direct access to the offset point of interest. The search engine uses metadata and free text annotations to index the files and retrieve the result list.
Mashup Video - show video demo -
Summary CMML is simple, but extensible CMML, timed URIs & Annodex enable a Video Web with CSS for styling and javascript interfaces More work necessary to meet all requirements, e. g. CSS for video transitions, Web caching, dynamic track composition on the server All work are open specifications and open source implementations Standardisation through IETF envisioned, but could turn into a W 3 C work group and recommendation
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