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CS 529 Multimedia Networking

CS 529 Multimedia Networking. Review. Digital Audio. What is the tradeoff between sample size and fidelity? Between sample rate and fidelity? What are the sample rate and sample sizes for typical voice-quality audio?

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CS 529 Multimedia Networking

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  1. CS 529 Multimedia Networking Review

  2. Digital Audio • What is the tradeoff between sample size and fidelity? Between sample rate and fidelity? • What are the sample rate and sample sizes for typical voice-quality audio? • If typical encoding captures a wave form “as it is”, what does MP3 attempt to do? And how?

  3. [RS75] • What is energy? • What is the zero crossing rate? • More importantly • how are they used? • why are they used?

  4. [RS75] • What is IMN? • How computed? • What is IMX? • How computed?

  5. Digital Video • What are typical frame rates for videos? • What are some common resolutions for videos? • How many bits are needed for “true color” images?

  6. QoS and Multimedia Applications • Rank sensitivity (low, medium, high) for Conversational Voice and Delay Streaming Video and Delay Conversational Voice and Bandwidth Streaming Video and Bandwidth

  7. Transport Protocols • One reason TCP is “good” for multimedia applications? Example? • One reason TCP is “bad” for multimedia applications? Example? • One reason UDP is “good” for multimedia applications? Example? • One reason UDP is “bad” for multimedia applications? Example?

  8. Buffering • What is a playout buffer? • What is it used for? • How big is it?

  9. RTP • What is it? • Can I use it instead of TCP/UDP? • What are some of the major features?

  10. SIP • What is it? • What services does it provide? • Registrar? • Proxy? • How does it allow for a “mobile” caller?

  11. Network Support for Multimedia? • What are alternatives to “best effort”? • What is a challenge to “guaranteed” QoS?

  12. Video Compression • How is it similar to image compression? • How is it different? • MPEG • What is a GoP?

  13. [WS00] • What is at least one implicit hypothesis the researchers test? • How are subjective audio quality ratings provided? • How are objective audio quality “costs” gathered?

  14. [WS00] • Provide order, best to worst Quiet – one recorded low volume, other norm Bad mic – one had low quality mic, other norm 5% loss – both voices, with repetition Loud – one recorded high volume, other norm 20% loss – both voices, with repetition Echo – one had open mic, no headset Reference– non-degraded

  15. [HHH+12] • Why is commercial streaming over HTTP confused? • Why is commercial streaming over HTTP timid?

  16. [RBV+12] • Which is best? • What else should be considered?

  17. [SJ95] • What is the E-Policy? • What is the I-Policy? • When, in general, is the E-Policy good? • When, in general, is the I-Policy good? • What is a talkspurt?

  18. [SJ95] • How does QM-120 work? • What is QM-(600,2)? What is the motivation behind it? • What is one item of future work?

  19. HCH09 10% 9% 8% 7% 6% 5% 4% 3% 2% 1% 0% 0% Significance of picture for Skype?

  20. HCH09 What is this graph? Where would Skype be?

  21. HKBT01 • What “alternate” service does ABE offer? • What is green traffic? • What is blue traffic?

  22. HKBT01 • What does it mean to say “Green does not hurt Blue”? • Based on below formula, what happens if green “cuts” in line? How do you fix it?

  23. HKBT01 Using DSD, what is the order of serving packets?

  24. HKBT01 What is the significance of this graph?

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