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ppt ppt Presentation Transcript

  • High Definition Video Real Time Multipoint Distribution Lud e k Matyska CESNET & Masaryk University Brno Czech Republic
  • What
    • Use HD (1920x1080, 60 fields (half frames) per second) to capture, store and distribute high quality video material for scientific and educational purposes – streaming
    • Use of HD to support high quality videoconferences
    • Research at multipoint high bandwidth stream distribution using overlay user controllable networks
  • iGrid2005 Demo Setup
    • HD Multipoint Videoconference (CZ101)
    • Three participating sites:
      • Masaryk University Brno, Czech Republic
      • Louisiana State University, Baton Rouge, Louisiana
      • UCSD, San Diego
  • How (Video)
    • Capture
      • HD camera SONY HVR-Z1E or HDR-FX1
      • AJA HD10A for analog (YUV) to SDI and DVS Centaurus for hw capture of HD-SDI
      • Encapsulation into IP using custom UltraGrid-based software, Chelsio 10Gb NICs (jumbo frames)
      • No compression, data stream of 1.5Gbps
    • Projection:
      • Decapsulation (including 10b to 8b color reduction, AMD64 optimized deinterlace implementation)
  • Video Configuration and Network
  • How (Network)
    • Virtual overlay network
      • Stream replication point(s) with software or hardware replication unit
    • User controllable packet reflector
      • 10 GE NIC from Chelsio
      • Dual AMD64 machine with 4GB RAM (BSD clone)
      • Only duplication of the 1.5 Gbps stream
    • Optical splitter considered
      • Access to the L1 needed
  • Reflector Setup
  • Why
    • HD provides good compromise between sufficient details in the picture and the price of necessary equipment (cameras and projection/display systems)
      • Videoconferencing
      • Interest by physicians for educational purposes
        • Surgery capture
      • Streaming access to lectures and other edu material
    • High bandwidth to create challenge for network development
  • Problems
    • Instability of dual AMD Opteron machines with 10GE Chelsio cards (T110/T210)
    • No full control over the newtork
      • Unexpected glitches out of our control
    • Still too high latency – still >500ms
      • Network gave 178ms between Brno and San Diego compared to the theoretical 50ms
      • Even uncompress video processing adds at least 100ms (both sides)
      • Replication units
  • Partners and People
    • CESNET/Masaryk University Brno:
      • Lud ěk Matyska , Petr Holub , Milo š Liška , Lukáš Hejtmánek, Jiří Denemark, Tomáš Rebok, Eva Hladká
    • CESNET:
      • Jan Radil , Stanislav Šíma, J an Gruntorád
    • Louisiana State University :
      • Andrei Hutanu , Ravi Paruchuri, Brian Ropers-Huilman , Ed Seidel