Audio and Video in HTML5 - London Web Standards 20.09.2010

Audio and Video in HTML5 NATIVE MULTIMEDIA SUPPORT Patrick H. Lauke / London Web Standards / London / 20 September 2010

HTML5 <!DOCTYPE html>

“...extending the language to better support Web applications [...] This puts HTML in direct competition with other technologies[...] , in particular Flash and Silverlight.” Ian Hickson, Editor of HTML5 http://lists.w3.org/Archives/Public/public-html/2009Jan/0215.html

<video>

Adobe Flash currently most common video delivery mechanism

<video src="video.webm" controls autoplay poster="poster.jpg" width="320" height="240"> <a href="video.webm">Download movie</a> </video>

video as native object ● “plays nice” with rest of the page ● keyboard accessibility built-in Demonstration of basic video, keyboard access, hover/transitions

video formats the big debate

MP4 / H.264 ubiquitous, patent encumbered, licensing/royalties

Ogg Theora “free and open”, no licensing/royalties not many tools for it, not web optimised

www.webmproject.org

WebM open and royalty-free, web optimised

www.youtube.com/html5

providing multiple sources <video controls autoplay poster="…" width="…" height="…"> <source src="movie.webm" type="video/webm" /> <source src="movie.ogv" type="video/ogg" /> <source src="movie.mp4" type="video/mp4" />  </video>

still include fallback for old browsers http://camendesign.com/code/video_for_everybody

powerful (simple) API to script your own controls

icant.co.uk/easy-youtube

www.w3.org/TR/html5/video.html#media-elements

controlling a <video> element var v = document.getElementById('player'); v.play(); v.pause(); v.volume = … ; v.currentTime = … ; …

events fired by <video> element var v = document.getElementById('player'); v.addEventListener('loadeddata', function() { … }, true) v.addEventListener('play', function() { … }, true) v.addEventListener('pause', function() { … }, true) v.addEventListener('timeupdate', function() { … }, true) v.addEventListener('ended', function() { … }, true) … Demonstration of basic and advanced video controls, swapping sources

people.opera.com/philipj/2010/07/21/html5-video-webinar/demos/track.html

<audio>

audio exactly the same as video <audio src=”music.mp3” controls autoplay></audio> [...] <audio controls autoplay> <source src="music.mp3" type="audio/mpeg" /> <source src="music.oga" type="audio/ogg" />  </audio> same format debacle: MP3 vs Ogg Vorbis (vs WAV) Demonstration of basic audio, scripted audio, note about controls

video and audio on any device without plugins (Java / Flash / Silverlight not ubiquitous)

is it all safe to use, right now?

don't do browser sniffing http://www.flickr.com/photos/timdorr/2096272747/

feature-detection for audio/video if (!!document.createElement('video').canPlayType;) { … } if (!!document.createElement('audio').canPlayType;) { … }

feature-detection for audio/video codecs var v = document.createElement('video'); if (!!(v.canPlayType)&& ((v.canPlayType('video/webm;codecs="vp8,vorbis"') == 'probably') || (v.canPlayType('video/webm;codecs="vp8, vorbis"') == 'maybe'))) { … }

feature-detection progressive enhancement, graceful degradation – or use shims http://diveintohtml5.org/everything.html

ready-made HTML5 audio/video players (for the lazy)

sublimevideo.net

videojs.com

HTML5 as Flashkiller?

not a question of HTML5 replacing Flash...

giving developers a choice!

www.opera.com/developer people.opera.com/patrickl/presentations/lws_20.09.2010/lws_20.09.2010.pdf patrick.lauke@opera.com

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Audio and Video in HTML5 - London Web Standards 20.09.2010

by Patrick Lauke

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