Transcript ppt 0.3MB - Star Tap

High Definition Video Real Time
Multipoint Distribution
Ludek 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, San Diego, CA
September 28, 2005
iGrid2005 Demo Setup
• HD Multipoint Videoconference (CZ101)
• Three participating sites:
– Masaryk University Brno, Czech Republic
– Louisiana State University, Baton Rouge, Louisiana
– UCSD, San Diego
iGrid2005, San Diego, CA
September 28, 2005
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)
iGrid2005, San Diego, CA
September 28, 2005
Video Configuration and Network
iGrid2005, San Diego, CA
September 28, 2005
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
iGrid2005, San Diego, CA
September 28, 2005
Reflector Setup
iGrid2005, San Diego, CA
September 28, 2005
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
iGrid2005, San Diego, CA
September 28, 2005
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
iGrid2005, San Diego, CA
September 28, 2005
Partners and People
CESNET/Masaryk University Brno:
Luděk Matyska, Petr Holub, Miloš Liška, Lukáš
Hejtmánek, Jiří Denemark, Tomáš Rebok, Eva
Hladká
CESNET:
Jan Radil, Stanislav Šíma, Jan Gruntorád
Louisiana State University:
Andrei Hutanu, Ravi Paruchuri, Brian RopersHuilman, Ed Seidel
iGrid2005, San Diego, CA
September 28, 2005