12 html5 audio and video


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12 html5 audio and video

  1. 1. HTML5 Audio and VideoPlaying movies in your websites without Flash orSilverlight
  2. 2. YouTube has been doing video for years—  How do they do it?—  Whats wrong with their solution?
  3. 3. The video that wenormally think of isreally a containerfor two things—  The stuff you see ◦  a video codec—  The stuff you hear ◦  an audio codec
  4. 4. The video container contains …—  Metadata—  Audio track(s)—  Video track—  Synchronizing markers
  5. 5. Containers come in many flavors—  Flashvideo (flv)—  Audio/video interleave (avi)—  Ogg (ogv)—  MPEG4 (mp4/m4v)—  WebM (webm)
  6. 6. Lets look at theaudio codecs first
  7. 7. Audio codecs are for saving the soundtracks—  Usuallythe container will have two tracks—  But some systems have six or more—  There are tons of audio codecs—  We only need three ◦  MP3 ◦  AAC ◦  Vorbis
  8. 8. —  The most common format—  Can have two channels—  Bitrates from 64 kbps to 320 kbps—  Can use variable bitrates—  Patented
  9. 9. AAC audio—  Introduced by Apple in 1997—  Up to 48 channels—  Better quality than MP3s—  Patented
  10. 10. —  Unpatented!—  Open source, in fact—  Unlimited channels
  11. 11. Now letslook at thevideo codecs—  There are tons but well focus on these:—  H.264—  Theora—  VP8
  12. 12. H.264 video—  Low-bandwidth—  High CPU requirements—  Patented and licensed—  Used in MP4/M4V containers
  13. 13. Theora video—  Royalty-free, no patents—  Fast, well-compressed—  Usually seen in an Ogg container
  14. 14. VP8 video—  Highquality—  Low complexity—  Bought by Google and released as open source
  15. 15. So how are the popular containers andcodecs usually combined?—  Ogg ◦  Theora video ◦  Vorbis audio—  MP4 ◦  AAC audio ◦  H.264 video—  WebM ◦  Vorbis audio ◦  VP8 video
  16. 16. What is supported whereBrowser Ogg MP4 WebM Firefox 3.5 No 4.0 Internet No IE9 IE9 Explorer Chrome 5 No 6 Opera 10.5 No 10.6 Safari No 3.0 No
  17. 17. Heres the bottom line …—  No one format is supported universally—  So encode your video in these formats ◦  WebM (VP8 video and Vorbis audio) ◦  MP4 (H.264 video and AAC audio) ◦  Ogg (Theora video and Vorbis audio)—  Link to all three versions and let the browser decide which one it wants.
  18. 18. Can we get tothe HTML now?
  19. 19. The <video> tag—  <video src="filename.mp4"—  width="320" height="240"—  ></video>
  20. 20. Hands-on a bare video tagDemo: a bare video tag
  21. 21. We can add controls to our video<video src="v.mp4" controls="on">!</video>!
  22. 22. Demo: Adding controlscontrols Hands-on adding
  23. 23. Other options—  autoplay—  loop—  muted—  poster="image/poster.jpg"—  preload="auto|metadata|none"
  24. 24. Demo: Other other video options Hands-on video options
  25. 25. You can point to multiple video files<video width="320" height="240" controls="controls">! <source src="CondscendingWonka.mp4"! type=video/mp4; codecs="avc1.42E01E, mp4a.40.2" />! <source src="CondscendingWonka.webm"! type=video/webm; codecs="vp8, vorbis" />! <source src="CondscendingWonka.ogv"! type=video/ogg; codecs="theora, vorbis" />!</video>!—  The browser will pick the first one that it supports
  26. 26. Demo: Multiple videosfor multiple browsersHands-on multiple videos for multiplebrowsers
  27. 27. Conclusion—  Thanks to HTML5 we can now play video directly in our pages with no plug-ins.—  There are still hurdles -- different browsers support different codecs—  To overcome that, we can create fallback videos to support just about any browser
  28. 28. Further Study—  The Miro video converter ◦  http://www.mirovideoconverter.com/—  Firefogg – a Firefox plug in converter ◦  http://www.firefogg.com—  Source for compatibility table ◦  http://camendesign.com/code/ video_for_everybody/test.html