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Systems Support for Continuous Media

Systems Support for Continuous Media. OOI WEI TSANG. Scope of this class. Systems Support: Application Middleware Operating System Continuous Media: Video, audio, animation. Local Media Applications. Watch Movie Listen to Music Video Editing : (Much Less Interesting …).

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Systems Support for Continuous Media

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  1. Systems Support for Continuous Media OOI WEI TSANG

  2. Scope of this class • Systems Support: • Application • Middleware • Operating System • Continuous Media: • Video, audio, animation

  3. Local Media Applications • Watch Movie • Listen to Music • Video Editing : (Much Less Interesting …)

  4. Network Media Applications • Live Webcast • Pre-recorded Webcast • Video Conferencing • Video on Demand

  5. Categories

  6. Streaming Media Requires • Reliable networks • Low latency • Bounded latency • Plenty of bandwidth Not in today’s Internet.

  7. Overview Encoder Decoder Middlebox Receiver Sender Network

  8. We will NOT • Design new codec • Study media processing • CS6212/CS5240 • Attempt to improve the Internet • EE5910

  9. Summary of TopicsCovered

  10. Encoder Decoder Middlebox Receiver Sender Network Sample of Topics Covered • Review of Media Compression • Network Communication Model

  11. Encoder Decoder Middlebox Receiver Sender Network Sample of Topics Covered • Adaptation • Video on Demand

  12. Encoder Decoder Middlebox Receiver Sender Network Sample of Topics Covered • Buffering • Audio/Video Synchronization • Packet Loss Recovery

  13. Encoder Decoder Middlebox Receiver Sender Network Sample of Topics Covered • Caching • Application-Level Multicast

  14. Lecture Philosophy • Cover the breadth, rather than depth • Classic papers, rather than recent papers

  15. Class Organization

  16. Goals • Learn about existing techniques and systems • Learn about current research efforts • Learn about how to do research

  17. Philosophy • Research oriented • Students are expected to be mature and independent • What you learned is more important than grade

  18. Please don’t ask.. • “Is this equation important?” • “Is this equation examinable?” • “Do I have to memorize this header format?” • “Post answer to quiz/survey/review”

  19. Please do ask .. • “What is the effect of changing k in the equation?” • “Why did the designer added this bit in the header?”

  20. Academic Honesty • No copying among students • No copying from published work ZERO TOLERENCE to Plagiarism

  21. Discussion? • Strongly encouraged .. • but • must acknowledge all contributions • write up solutions independently

  22. Gilligan’s Island Rule • Discuss with friends • Throw notes away • Go watch “Gilligan’s Island” (or “Phua Chu Kang”, or “Super Sunday”) • Write down your solution

  23. Continuous Assessments

  24. Continuous Assessments • Project (50%) • Paper Survey (20%) • Paper Review (15%) • One of • Programming Assignment • Random Quizzes • Class Participation • Mid-term

  25. Research Project • Define a problem • Propose a solution • Implement the solution • Evaluate the solution

  26. Types of Project • New problem + solution • Existing problem + new solution • Existing problem + existing solutions + comparisons + new insights • See website for more..

  27. Variations • Combine with your own research • subjected to your advisor’s approval • Combine with another class project • subjected to the other instructor’s approval • must be more significant

  28. Research Project • Deliverables: • 10-12 page paper • poster presentation • demo (if applicable) • In a group of 1 to n students

  29. Survey Paper • In-depth study of a topic • 4-10 papers expected • Suggested list of topics available (can be the same topic as your project!)

  30. Survey Paper • summarize recent results • organize, generalize, categorize • add understanding

  31. Survey Paper • Deliverables: • 10-12 page survey paper • Individual work

  32. Paper Reviews • Read, summarize, and criticize 10 papers • One is assigned almost weekly • Deliverables: • One page report per paper

  33. Expected Workload • Read 3-4 papers per week • Some hours of coding per week

  34. Office Hours • Saturday • 11 am – 12 noon • SOC1 04-20 • or email for appointment • or just pop in

  35. Web Sites • Main Website • http://www.comp.nus.edu.sg/~cs5248 • IVLE Website

  36. Questions

  37. Review of Media Compression

  38. Encoder Decoder Middlebox Receiver Sender Network You are Here

  39. Why compress? • “Bandwidth Not Enough” • “Disk Space Not Enough” • Size of Uncompressed DVD Movie =

  40. Why compress? • “Bandwidth Not Enough” • “Disk Space Not Enough” • Size of Uncompressed DVD Movie = 720 x 576 x 3 x 25 x 60 x 120 =208.6GB

  41. JPEG Compression

  42. Original Image (1153KB) 1:1

  43. Original Image (1153KB) 3.5:1

  44. Original Image (1153KB) 17:1

  45. Original Image (1153KB) 27:1

  46. Original Image (1153KB) 72:1

  47. Original Image (1153KB) 192:1

  48. Compression Ratio

  49. Magic of JPEG • Throw away information we cannot see • Color information • “Low-frequency signals” • Rearrange data for good compression • Use standard compression

  50. Throw away color information Y V U

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