際際滷

際際滷Share a Scribd company logo

Video Technology

Jason Silverstein
Jason Silverstein

A high-level look at why different video technologies behave differently at the user experience level. Prepared for education at Observer.

1 of 24
Downloaded 68 times
Video Delivery A High-Level Look Sunday, May 17, 2009
Disclaimer The following slides are meant only to describe high-level interactions. Many more variables exist in any video discussion. Sunday, May 17, 2009
Issue at Hand Video Performance Sometimes slow, choppy - Why? Bandwidth Video Encoding and Delivery Receiving Video Sunday, May 17, 2009
Bandwidth Bit rate = data transfer rate and/or the encoded quality of a video 鍖le Larger bit rates require more network and storage use Resolution = video display size/quality Larger resolutions require more network and storage use Sunday, May 17, 2009
Video Encoding/Delivery Video Encoding Different formats, such as Windows Media or Flash, require different technologies for delivery Delivery from Server Streaming = delivers in small chunks Download = delivers all at once Sunday, May 17, 2009
End Users Players Some are plug-ins only, others are plug- ins calling local applications Browser Different browsers handle plug-ins and delivery protocols differently Act differently depending on OS Sunday, May 17, 2009
Use Cases Common Streaming Video - server to client Downloading Video - server to client Uncommon Streaming Video - server to terminal server to client (terminal services) Sunday, May 17, 2009
Delivery - Server/Client Streaming Progressive Download Streaming Server Download Server vs. Client Client connection connection connection connection begins ends begins ends Sunday, May 17, 2009
Perfect Storm (Part I) All variables must match for good end user experience Server technology, client technology, bandwidth capacity, etc. Now, lets add another layer - Terminal Server, which acts like a streaming technology (delivers in small chunks) Sunday, May 17, 2009
Delivery - Terminal Streaming Progressive Download Streaming Server Download Server Terminal Server vs. Terminal Server Client Client connection connection connection connection begins ends begins ends Sunday, May 17, 2009
Perfect Storm (Part II) All variables still must match for good end user experience Server technology, client technology, bandwidth capacity, etc. Terminal Server introduces con鍖icting technologies for downloaded video, which is main Charlotte.com delivery Download too heavy to transfer seamlessly Sunday, May 17, 2009
Questions? Jason Silverstein Interactive | General and Product Mgmt jsilverstein@charlotte.com Sunday, May 17, 2009
(intentionally blank) Sunday, May 17, 2009
Backup 際際滷s Sunday, May 17, 2009
Video Encoding Windows Media Microsoft proprietary from client to server to encoding to delivery Live and on-demand are high quality Streaming is most prevalent delivery Capable of Digital Rights Management (DRM) and HD quality Sunday, May 17, 2009
Video Encoding (cont) Flash Technology Format created by Macromedia (now Adobe), made famous by YouTube Encoding more ef鍖cient than Microsoft but relies on third-party video (On2) and audio (mp3) Usually delivered via download Lacks HD and DRM capabilities Sunday, May 17, 2009
Video Encoding (cont) QuickTime Apple proprietary application Uses proprietary and/or standards for encoding content Capable of HD and DRM (both are industry standards) Download is most common delivery Sunday, May 17, 2009
Bit Rate & Resolution Part of encoding process Bit rate rises as quality increases; dial-up video = 56 kbps, DSL = 300 kbps, e.g. Resolution measures pixels high and wide; larger numbers create larger 鍖le sizes Bit Rate and Resolution both affect playback, especially for downloads Sunday, May 17, 2009
Client Technologies Windows Media Player Plays Windows Media primarily; can do some other online formats Can play live or on-demand Plug-in calls in application from OS, meaning longer start times Tightly integrated into OS through delivery chain Sunday, May 17, 2009
Client Technologies (cont) Flash Lightweight plug-in Plays Flash video only (on purpose) Can play live or on-demand Considered best web experience by many Sunday, May 17, 2009
Client Technologies (cont) QuickTime QuickTime primarily; other online formats are possible Can play live or on-demand Plug-in calls in application from OS, meaning longer start times Sunday, May 17, 2009
Video Delivery Progressive Download (aka PDL) Using a web server to deliver video in an on-demand capacity only Once request is made, entire 鍖le is delivered at once No further requests or communication with server Sunday, May 17, 2009
Video Delivery (cont) Streaming Uses a specialized server and software to deliver video in small, streamed bits to the client Connection between client and server is constant through delivery Can be used for live or on-demand Sunday, May 17, 2009
(intentionally blank) Sunday, May 17, 2009

More Related Content

Video Technology

  • 1. Video Delivery A High-Level Look Sunday, May 17, 2009
  • 2. Disclaimer The following slides are meant only to describe high-level interactions. Many more variables exist in any video discussion. Sunday, May 17, 2009
  • 3. Issue at Hand Video Performance Sometimes slow, choppy - Why? Bandwidth Video Encoding and Delivery Receiving Video Sunday, May 17, 2009
  • 4. Bandwidth Bit rate = data transfer rate and/or the encoded quality of a video 鍖le Larger bit rates require more network and storage use Resolution = video display size/quality Larger resolutions require more network and storage use Sunday, May 17, 2009
  • 5. Video Encoding/Delivery Video Encoding Different formats, such as Windows Media or Flash, require different technologies for delivery Delivery from Server Streaming = delivers in small chunks Download = delivers all at once Sunday, May 17, 2009
  • 6. End Users Players Some are plug-ins only, others are plug- ins calling local applications Browser Different browsers handle plug-ins and delivery protocols differently Act differently depending on OS Sunday, May 17, 2009
  • 7. Use Cases Common Streaming Video - server to client Downloading Video - server to client Uncommon Streaming Video - server to terminal server to client (terminal services) Sunday, May 17, 2009
  • 8. Delivery - Server/Client Streaming Progressive Download Streaming Server Download Server vs. Client Client connection connection connection connection begins ends begins ends Sunday, May 17, 2009
  • 9. Perfect Storm (Part I) All variables must match for good end user experience Server technology, client technology, bandwidth capacity, etc. Now, lets add another layer - Terminal Server, which acts like a streaming technology (delivers in small chunks) Sunday, May 17, 2009
  • 10. Delivery - Terminal Streaming Progressive Download Streaming Server Download Server Terminal Server vs. Terminal Server Client Client connection connection connection connection begins ends begins ends Sunday, May 17, 2009
  • 11. Perfect Storm (Part II) All variables still must match for good end user experience Server technology, client technology, bandwidth capacity, etc. Terminal Server introduces con鍖icting technologies for downloaded video, which is main Charlotte.com delivery Download too heavy to transfer seamlessly Sunday, May 17, 2009
  • 12. Questions? Jason Silverstein Interactive | General and Product Mgmt jsilverstein@charlotte.com Sunday, May 17, 2009
  • 15. Video Encoding Windows Media Microsoft proprietary from client to server to encoding to delivery Live and on-demand are high quality Streaming is most prevalent delivery Capable of Digital Rights Management (DRM) and HD quality Sunday, May 17, 2009
  • 16. Video Encoding (cont) Flash Technology Format created by Macromedia (now Adobe), made famous by YouTube Encoding more ef鍖cient than Microsoft but relies on third-party video (On2) and audio (mp3) Usually delivered via download Lacks HD and DRM capabilities Sunday, May 17, 2009
  • 17. Video Encoding (cont) QuickTime Apple proprietary application Uses proprietary and/or standards for encoding content Capable of HD and DRM (both are industry standards) Download is most common delivery Sunday, May 17, 2009
  • 18. Bit Rate & Resolution Part of encoding process Bit rate rises as quality increases; dial-up video = 56 kbps, DSL = 300 kbps, e.g. Resolution measures pixels high and wide; larger numbers create larger 鍖le sizes Bit Rate and Resolution both affect playback, especially for downloads Sunday, May 17, 2009
  • 19. Client Technologies Windows Media Player Plays Windows Media primarily; can do some other online formats Can play live or on-demand Plug-in calls in application from OS, meaning longer start times Tightly integrated into OS through delivery chain Sunday, May 17, 2009
  • 20. Client Technologies (cont) Flash Lightweight plug-in Plays Flash video only (on purpose) Can play live or on-demand Considered best web experience by many Sunday, May 17, 2009
  • 21. Client Technologies (cont) QuickTime QuickTime primarily; other online formats are possible Can play live or on-demand Plug-in calls in application from OS, meaning longer start times Sunday, May 17, 2009
  • 22. Video Delivery Progressive Download (aka PDL) Using a web server to deliver video in an on-demand capacity only Once request is made, entire 鍖le is delivered at once No further requests or communication with server Sunday, May 17, 2009
  • 23. Video Delivery (cont) Streaming Uses a specialized server and software to deliver video in small, streamed bits to the client Connection between client and server is constant through delivery Can be used for live or on-demand Sunday, May 17, 2009