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Low-latency HD: Shared Spaces and Undersea Window

John Roston and Jeremy R. Cooperstock Centre for Interdisciplinary Research in Music Media and Technology McGill University. Low-latency HD: Shared Spaces and Undersea Window. Low-latency. Videoconferencing: The Future?. Zack Snyder’s “Online Jam”, October 2001.

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Low-latency HD: Shared Spaces and Undersea Window

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  1. John Roston and Jeremy R. CooperstockCentre for Interdisciplinary Research in Music Media and TechnologyMcGill University Low-latency HD: Shared Spaces and Undersea Window

  2. Low-latency

  3. Videoconferencing: The Future? • Zack Snyder’s “Online Jam”, October 2001

  4. For those with DSL at home... • yeah, right!

  5. “Playing Together” experiment • New York-Ottawa, Remote Masters class, Dec. 8, 2000 Pinchas Zuckerman, Columbia U, NYC Wu Ji, Canarie ARDNOC, Ottawa

  6. Latency: The Interaction-Killer • or put another way...

  7. Bandwidth vs. Latency • near-equivalent quality of encoded video (HD-SDI vs HDV or SDI vs DV/MPEG) at greatly reduced bandwidth • but… compression takes time

  8. smallensemble large ensemble speech, drumming lip synch compress acquire transmit MPEG* light speed: Mtl-LA net latency Mtl-LA networks Tolerated Synchronicity activity 100ms 90 0 10 20 80 30 40 60 70 50 * This is a theoretical “best-case” scenario. Actual performance may vary. The manufacturer makes no warranties, either express or implied, and will not be held liable for damage resulting from use of the product. Certain restrictions may apply. Offer void where prohibited by law. Batteries not included.

  9. Current Projects

  10. Going deep under… to 2000m • HD video over new undersea networks – • VENUS and NEPTUNE

  11. “Undersea Window” Project • VENUS – Test Camera 100m • NEPTUNE – Cameras 2,000m

  12. System Architecture

  13. Shared Spaces: Panoramic High-Def • See everything - no camera panning

  14. Conference Room Configuration

  15. local loop for end-end lightpath prgram scope Network Architecture C4 OME @RISQ C4 OME @BCnet UBC 10G switch McGill 10G switch BCnet fibre RISQ fibre to servers w/ GbE i/f to servers w/ GbE i/f CA*net 4 10G Wan Phy OC-192 10G Wan Phy

  16. New challenge: Real-time mosaicing

  17. Sample Result • Can your camera do this?

  18. Previous Projects

  19. Distributed Violin Duet • McGill-Université de Montréal demo, Nov. 21, 2001 • IP over 1 Gbps fiber link • < 30ms latency

  20. McLuhan: “The medium is the message” • Cooperstock's Corollary: • “The medium must be faster than the message.” * * but between protocol deficiencies (TCP, UDP), competing data flows, process scheduling on a budget, ARQ (retransmission management) without QoS, interface HW/SW “uncooperativeness”, aggressive router policies, multi-format support, echo suppression, and interface complexity… it’s much more than just the medium

  21. Violin Masters Class • Montreal-Ottawa Trial with Pinchas Zuckerman, Feb. 20, 2002

  22. Size does matter

  23. Distributed Jazz Jam • Montreal-Stanford (CCRMA), Research Demo, Oct. 24, 2002

  24. The “Sweet Spot” Problem

  25. Vibrosensory Transmission • VRQ demo, March 8, 2004

  26. … and another application

  27. Thank you. Further information available:http://ultravideo.mcgill.edu

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