Ogv.js: bringing open codecs to Safari and IE with emscipten
| Action | Key |
|---|---|
| Play / Pause | K or space |
| Mute / Unmute | M |
| Toggle fullscreen mode | F |
| Select next subtitles | C |
| Select next audio track | A |
| Toggle automatic slides maximization | V |
| Seek 5s backward | left arrow |
| Seek 5s forward | right arrow |
| Seek 10s backward | shift + left arrow or J |
| Seek 10s forward | shift + right arrow or L |
| Seek 60s backward | control + left arrow |
| Seek 60s forward | control + right arrow |
| Seek 1 frame backward | alt + left arrow |
| Seek 1 frame forward | alt + right arrow |
| Decrease volume | shift + down arrow |
| Increase volume | shift + up arrow |
| Decrease playback rate | < |
| Increase playback rate | > |
| Seek to end | end |
| Seek to beginning | beginning |
You can right click on slides to open the menu
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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.
Creation date:
Oct. 15, 2015
License:
CC BY-SA 3.0
Links:
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