Hollerback's Guide to Digital Video on the Web

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A quick introductory guide to terminology and modern techniques for dealing with uploading and downloading video on the web and across mobile devices. This presentation also covers the basics of video size, compressions, bitrate, color depth, and streaming.

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Hollerback's Guide to Digital Video on the Web

  1. 1. digital video
  2. 2. overviewterminology and technology
  3. 3. bitrateamount of data over timeW x H x FPS x (CD / CF)
  4. 4. color depth (CD)number of bits used to indicate color
  5. 5. example color depths1-bit 2^1 2 colors, black and white8-bit 2^8 256 colors...true color 2^24 16,777,216 colors
  6. 6. bits per framedimensions (W,H) X color depth (CD)
  7. 7. bitrate (bits per second)bits per frame X frames per second
  8. 8. 600 x 480, 24bit, 25fps, 1 hour600 x 480 = 307,200 pixels / frame24 x 307,200 = 7.37 Mbits / frame25 x 7.37 = 184.25 Mbits / second184.25 * 3600 seconds = 82.6Gbytes
  9. 9. measuring compressionbitrate = W x H x FPS x (CD / CF)CD / CF = average bits per pixel (BPP)
  10. 10. measuring compressiona normal video with true color is 24 bits/pixeljpeg/frame 1 - 8 bits/pixelmpeg4 less than 1 bits/pixel
  11. 11. H.264 / MPEG4 Part 10● final draft finished in 2003● youtube, vimeo, itunes store, adobe flash,microsoft silverlight● competitors○ vp8 / webm - google - free - under BSD license
  12. 12. The Future is Soon - H.265, HEVC● High Efficiency Video Coding● final draft finished in 2013● 50% bitrate savings - cut bandwidthrequirements in half● hardware needs to catch up, might be 18months down the road till mass hardwareadoption
  13. 13. HTTP Live Streaming● protocol by Apple, Inc.● no need for expensive server software (i.eflash media server)● m3u8 playlist and mpeg4 transport streamfiles● adaptive (multiple bitrates)
  14. 14. See it in action...www.hollerback.co

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