1. 1 On the Quality of Experience of SopCast Benny Fallica, Yue Lu, Fernando Kuipers, Rob Kooij, and Piet Van Mieghem

2. 2 Introduction P2PTV is increasingly popular Has P2PTV advantages over IPTV? Quality of Service Scalability Security Quality of Experience … Aim of this talk: Discuss Quality of Experience of SopCast

3. 3 Overview Experimental set-up Traffic characteristics Quality of Experience Conclusions

4. 4 Experimental set-up Source Provider: SopCast Server Each node: SopCast Client, TCPDump, VLC, Perl scripts. Nodes join and leave, view our TV channel Capture traffic at each node. (>40GB data) Capture the received stream at each node off-line QoE evaluation.

5. 5 Upload and download rate Traffic characteristics (1/3)

6. 6 Traffic characteristics (2/3) Parents’ upload rate per peer

7. 7 Y. Lu, F.A. Kuipers, M. Janic, and P. Van Mieghem, “E2E blocking probability of IPTV and P2PTV,” Proc. of IFIP Networking 2008, Singapore, 2008 (nominated for best paper award). Download rate Blocking Traffic characteristics (3/3)

8. 8 Quality of Experience (1/4) What? Video Quality in terms of MOS How?Use VQM (ITU-T R.144) Result: Hardly any degradation of video quality

9. 9 Quality of Experience (2/4) What? Audio-Video synchronization How?Use Audio-Video test sequence Result: audio-video: 210 ms out-of-sync

10. 10 Quality of Experience (3/4) Mean ~50 s What? Channel Zapping time How?Measure through automated script Result: Zapping time unacceptably high

11. 11 Quality of Experience (4/4) What? Synchronization among peers How? Capture clips at several nodes simultaneously Result: Peer lag of 3 seconds

12. 12 Conclusions Observation of SopCast traffic characteristics Evaluation of various aspects of QoE for SopCast users Provided many innovative measurement methods

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