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Audio and Video in HTML5 - London Web Standards 20.09.2010
- 1. Audio and Video in HTML5 NATIVE MULTIMEDIA SUPPORT Patrick H. Lauke / London Web Standards / London / 20 September 2010
- 3. “...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
- 4. <video>
- 5. Adobe Flash currently most common video delivery mechanism
- 6. <object width="425" height="344"> <param name="movie" value="http://www.youtube.com/v/9sEI1AUFJKw&hl=en &fs=1&"></param> <param name="allowFullScreen" value="true"></param> <param name="allowscriptaccess" value="always"></param> <embed src="http://www.youtube.com/v/9sEI1AUFJKw&hl=en&f s=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed> </object>
- 8. <video src="video.webm" controls autoplay poster="poster.jpg" width="320" height="240"> <a href="video.webm">Download movie</a> </video>
- 9. video as native object ● “plays nice” with rest of the page ● keyboard accessibility built-in Demonstration of basic video, keyboard access, hover/transitions
- 10. video formats the big debate
- 11. MP4 / H.264 ubiquitous, patent encumbered, licensing/royalties
- 12. Ogg Theora “free and open”, no licensing/royalties not many tools for it, not web optimised
- 14. WebM open and royalty-free, web optimised
- 17. 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" /> <!-- fallback content --> </video>
- 18. still include fallback for old browsers http://camendesign.com/code/video_for_everybody
- 19. <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" /> <object width="…" height="…" type="application/x- shockwave-flash" data="player.swf"> <param name="movie" value="player.swf" /> <param name="flashvars" value=" … file=movie.mp4" /> <!-- fallback content --> </object> </video>
- 20. powerful (simple) API to script your own controls
- 23. controlling a <video> element var v = document.getElementById('player'); v.play(); v.pause(); v.volume = … ; v.currentTime = … ; …
- 24. 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
- 26. <audio>
- 27. 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" /> <!-- fallback content --> </audio> same format debacle: MP3 vs Ogg Vorbis (vs WAV) Demonstration of basic audio, scripted audio, note about controls
- 28. video and audio on any device without plugins (Java / Flash / Silverlight not ubiquitous)
- 30. is it all safe to use, right now?
- 31. don't do browser sniffing http://www.flickr.com/photos/timdorr/2096272747/
- 33. feature-detection for audio/video if (!!document.createElement('video').canPlayType;) { … } if (!!document.createElement('audio').canPlayType;) { … }
- 34. 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'))) { … }
- 35. feature-detection progressive enhancement, graceful degradation – or use shims http://diveintohtml5.org/everything.html
- 36. ready-made HTML5 audio/video players (for the lazy)
- 37. sublimevideo.net
- 38. videojs.com
- 40. not a question of HTML5 replacing Flash...
- 41. giving developers a choice!
- 42. www.opera.com/developer people.opera.com/patrickl/presentations/lws_20.09.2010/lws_20.09.2010.pdf patrick.lauke@opera.com