Ogv.js: bringing open codecs to Safari and IE with emscipten
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59Creation date:
Oct. 15, 2015Speakers:
Brion VibberLicense:
CC BY-SA 3.0Description
The ogv.js project will soon be used on Wikipedia and Wikimedia Commons to provide playback of Ogg and WebM media in Safari and MS IE/Edge browsers without requiring codec or plugin downloads -- including on iOS and Windows 10 Mobile.
This replaces the old Cortado Java applet as a compatibility shim for relatively recent browsers that still lack built-in WebM or Ogg support, and provides an API more similar to the native HTML5 video element.
The project uses the emscripten cross-compiler to produce JavaScript code from the standard C codec libraries (libtheora, libvorbis, libopus, libvpx), which is then wrapped in a fairly lightweight JavaScript framework to run decoding and send output to a canvas element and Web Audio (or Flash on IE 10/11).
The JavaScript platform carriers a number of interesting challenges: slightly funky compilation, performance bottlenecks, limitations on threading, and a lack of synchronous i/o which some libraries expect.
Brion Vibber is currently the Lead Software Architect for the Wikimedia Foundation and a member of the Mobile Apps development team.
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