periodic broadcasting with vbr encoded video n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Periodic Broadcasting with VBR-Encoded Video PowerPoint Presentation
Download Presentation
Periodic Broadcasting with VBR-Encoded Video

Loading in 2 Seconds...

play fullscreen
1 / 17

Periodic Broadcasting with VBR-Encoded Video - PowerPoint PPT Presentation


  • 98 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Periodic Broadcasting with VBR-Encoded Video' - efrat


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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
Presentation Outline
  • Introduction
  • Related Works & Motivation
  • Near VoD with VBR Encoded Video
  • Conclusion
introduction
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.
related works
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.

motivation
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.
near vod with vbr encoded video

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.

near vod with vbr encoded video1
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
system model
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.
system model1
System Model
  • Therefore, the aggregated bandwidth at time t defined is
  • The Server bandwidth is C Mbps
  • The probability of loss
simulation settings
Simulation Settings
  • The total number of video, M =10.
  • The average bit-rate of the video is 2 Mbps.
vbr and cbr comparison
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)
conclusion
Conclusion
  • This scheme proposed a modified version of Pyramid Broadcasting scheme to support VBR video streaming.