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Periodic Broadcasting with VBR-Encoded Video

Periodic Broadcasting with VBR-Encoded Video. Despina Saparilla, Keith W. Ross and Martin Reisslein (1999) Prepared by Nera Liu Wing Chun. Presentation Outline. Introduction Related Works & Motivation Near VoD with VBR Encoded Video Conclusion. Introduction.

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Periodic Broadcasting with VBR-Encoded Video

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  1. Periodic Broadcasting with VBR-Encoded Video Despina Saparilla, Keith W. Ross and Martin Reisslein (1999) Prepared by Nera Liu Wing Chun

  2. Presentation Outline • Introduction • Related Works & Motivation • Near VoD with VBR Encoded Video • Conclusion

  3. Introduction • Traditional Video-on-Demand (VoD) System (True VoD) • It is unicast-based system. • As every user requires a dedicated channel (resources including server and network bandwidth etc.), it is not scalable enough.

  4. Related Works • Close-loop architectures • It schedules video streams dynamically according to user arrival pattern. • For example: Patching • Open-loop architectures • It has a fixed schedules for all video streaming irrespective of the user arrival. • For example: NVoD K. A. Hua, Y. Cai, and S. Sheu, “Patching: A Multicast Technique for True Video-on-Demand Services,” Proceedings of the 6th International Conference on Multimedia, Sep 1998, pp. 191-200.

  5. Motivation • However, most of the architectures are based on the assumption of constant bit-rate video. • With the fact that the average bit rate for CBR video is typically 2 times or more the average bit rate of VBR video of the same perceptional visual quality. • VBR video streaming has a potential to increase the system efficiency.

  6. Channels The challenge here is to guarantee the continuous playback. L0 L0 L0 L0 L0 L0 L0 L0 …. L1 L1 L1 L1 L2 L2 Client arrival L0 L1 L2 time Near VoD with VBR Encoded Video • Pyramid Broadcasting Scheme • Video is partitioned into video segment with Li+1 =  Li • Max Startup Latency = L0 • Client Access Bandwidth = 2b, b is the video bit-rate S. Viswanathan and T. Imielinski, “Metropolitan Area Video-on-Demand Service Using Pyramid Broadcasting,” IEEE Multimedia Systems, vol. 4, 1996, pp. 197-208.

  7. Near VoD with VBR Encoded Video • Pyramid Broadcasting Scheme • Video is partitioned into video segment with Li+1 =  Li • Max Startup Latency = L0 • Client Access Bandwidth = 2b, b is the video bit-rate • Proposed Scheme • Video is partitioned into video segment with Li+1 = 2Li • Max Startup Latency = L0 • Client Access Bandwidth = qb, b is the video bit-rate

  8. System Model • The system has M videos and each video is divided according to scheme of Pyramid Broadcasting. • xi(m) represents the ith video sequence of mth video. • yt(m,k) represents the video sequence of mth video multicasting over the kth channel at time t.

  9. System Model • Therefore, the aggregated bandwidth at time t defined is • The Server bandwidth is C Mbps • The probability of loss

  10. Simulation Settings • The total number of video, M =10. • The average bit-rate of the video is 2 Mbps.

  11. Bufferless Statistical Multiplexing

  12. Bufferless Statistical Multiplexing with GoP Smoothing

  13. Bufferless Statistical Multiplexing with GoP Smoothing K=7 K=6

  14. Buffered Statistical Multiplexing K=6 K=7 K=6

  15. VBR and CBR Comparison • The bit rate of CBR video is 1.8 times of the VBR video. (For example is the bit rate of VBR is 2Mbps, the CBR is 3.6Mbps)

  16. Conclusion • This scheme proposed a modified version of Pyramid Broadcasting scheme to support VBR video streaming.

  17. Q & A

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