Amir Zmora’s Presentation at eComm 2009

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IP Video Communications Issues and Solutions

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Amir Zmora’s Presentation at eComm 2009

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

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