Amir Zmora’s Presentation at eComm 2009

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IP Video Communications Issues and Solutions

IP Video Communications Issues and Solutions

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Transcript

  • 1.  
  • 2. IP Video Communication Issues & Solutions
    • Amir Zmora, RADVISION
  • 3. State of IP Video Communication
  • 4. From Picturephone to Telepresence
  • 5. This is Telepresence
    • Matt Harding dancing over Telepresence @ Yahoo headquarters
  • 6. Evolution of Video Standards
  • 7. H.26x Lifecycle Status H.264 H.263 H.261
  • 8. Who is to Blame?
    • The network
    • Bandwidth
    • Packet Loss
    • Burstiness
  • 9. Packet Loss
  • 10. Packet Loss Random Noise Artifacts
  • 11. Insufficient Bandwidth Trails
  • 12. High Compression Rate Blockiness Effect
  • 13. Advanced Video Coding Technologies Focus on Quality of Experience
  • 14. P-Frame Dependency Result – Packet loss has dramatic effect on quality of experience 1 2 3 4 5
  • 15. Multi Description Coding
    • Splitting one source of information to multiple entities
    • Each decodable
    • The more the merrier – Quality
    • Example – splitting of PCM stream
  • 16. Scaled Video Coding (SVC)
    • Uses MDC concept
    • H.264 Annex G
    • Spatial - Change of frame size (resolution)
    • Temporal - Change of frame rate
    • Fidelity / SNR - Change of quality
    • Object - Selection of “Region of interest”
  • 17. Spatial Scalability
  • 18. Temporal Scalability
    • Hierarchal P Structure
  • 19. Signaling layered decoding dependency 96 97 98 99 100 101 OR OR AND L1 L2 L3
  • 20. Error Resilience – Protecting only what Matters
    • Forward Error Correction
    • Retransmission
    • Video Fast Update
  • 21. Error Resilience MDC: Hierarchical P-Structure
  • 22. Putting it All Together
  • 23.