Putting the "Ultra in UltraGrid: Full rate Uncompressed HDTV Video Conferencing
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1 Putting the "Ultra in UltraGrid: Full rate Uncompressed HDTV Video Conferencing Ladan Gharai... University of Southern California/ISI Colin Perkins..... University of Glasgow Alvaro Saurin University of Glasgow
2 Outline The UltraGrid System Beyond 1 Gbps Experimentation Lab Experiments Network Experiments Summary
3 The UltraGrid System UltraGrid is ultra-high quality video conferencing tool Supports uncompressed High Definition TV video formats Video codecs: Digital Video (DV) Incurs minimum latency Adaptable to network conditions Not solely a video conferencing tool: HDTV distribution system for editing purposes general purpose SMPTE292M-over-IP system High-definition visualization and remote steering applications
4 Approach Build a system that can be replicated and built by other HDTV enthusiasts: Use hardware that is commercially available All audio and video codecs are open source Use standard protocols: Real-time Transport Protocol (RTP) Custom payload formats and profiles where necessary Software available for download
5 Outline The UltraGrid System Beyond 1 Gbps Experimentation Lab Experiments Network Experiments Summary
6 Beyond 1 Gbps We have previously successfully demonstrated UltraGrid at ~1Gbps Supercomputing 2002 Video is down sampled at the sender: Color is down sampled from 10bits to 8bits Auxiliary data removed Why < 1 Gbps limitation? limitation is the Gigabit Ethernet NIC Solutions: 1. 2 Gigabit Ethernet NICs Gigabit Ethernet NIC
7 The (new) UltraGrid node 10 Gigabit Ethernet NIC: T110 10GbE from Chelsio: 133Mhz/PCI-X
8 The (new) UltraGrid node 10 Gigabit Ethernet NIC: T110 10GbE from Chelsio: 133Mhz/PCI-X HDTV capture card: Centaurus HDTV capture card from same SDK as HDstation 100Mhz/PCI-X
9 The (new) UltraGrid node 10 Gigabit Ethernet NIC: T110 10GbE from Chelsio: 133Mhz/PCI-X HDTV capture card: Centaurus HDTV capture card from same SDK as HDstation 100Mhz/PCI-X Dual Xeon EM64T Power Station SuperMicro mother board 5 programmable PCI-X slots 32bit Fedora Core3 - Linux 2.6 Kernel
10 UltraGrid: Architectural Overview display grabber An open and flexible architecture with plug-in support for codecs and transport protocols: decoder Playout buffer encoder Packetization rat Codec Support: DV, RFC 3189 M-JPEG, RFC 2435 H.261, RFC 2032 Transport + Congestion Control UltraGrid Node Transport protocols: RTP/RTCP RFC 3550 Congestion Control: TCP Friendly Rate Control (TFRC), RFC 3448
11 UltraGrid: Architectural Overview HDTV/DV camera Grabber thread Transmit thread Frame Grabber Video Codec RTP Framing Send buffer RTP Sender Receive thread Congestion Control RTCP Network Colour Conversion Video Codec RTP Framing Playout buffer RTP Receiver Display Display thread Display
12 Software modifications Both capture cards operate in 10bit or 8bit mode Update code to operate in 10bit mode packetization must operate in 10bit mode packetization is based on draft-ietf-avt-uncomp-video-06.txt Supports range of formats including standard & high definition video Interlaced and progressive RGB, RGBA, BGR, BGRA, YUV Various color sub-sampling: 4:4:4, 4:2:2, 4:2:0, 4:1:1
13 Outline The UltraGrid System Beyond 1 Gbps Experimentation Lab Experiments Network Experiments Summary
14 Experimentation 1. Lab Tests Back to back 2. Network Tests The DRAGON Metropolitan Area Network Measured: Throughput Packet loss and reordering Frame inter-display times Packet interarrival times at sender and receiver Measured on a subset of packets
15 Lab Tests LDK-6000 PDP-502MX SMPTE 292M Centaurus 10 GigE UltraGrid Sender Gbps RTP/UDP/IP Centaurus 10 GigE UltraGrid Receiver SMPTE 292M
16 Lab Tests LDK-6000 PDP-502MX SMPTE 292M Centaurus 10 GigE UltraGrid Sender Gbps RTP/UDP/IP Centaurus 10 GigE UltraGrid Receiver SMPTE 292M Back-2-back tests: Duration: 10 min RTT: 70 µs MTU: 8800 bytes
17 Lab Tests LDK-6000 PDP-502MX SMPTE 292M Centaurus 10 GigE UltraGrid Sender Gbps RTP/UDP/IP Centaurus 10 GigE UltraGrid Receiver SMPTE 292M Back-2-back tests: Duration: 10 min RTT: 70 µs MTU: 8800 bytes Results: No loss or reordering Mbps throughput Total 10,178,098 packets sent and received
18 Inter-packet Intervals: Sender vs. Receiver
19 Inter-packet Intervals: Sender vs. Receiver
20 Frame inter-display times 1/60 sec µ m
21 Network Tests Network tests were conducted over a metropolitan network in the Washington D.C. area, known as the DRAGON network. DRAGON is a GMPLS based multiservice WDM network and provides transport at multiple network layers including layer3, layer2 and below. DRAGON allows the dynamic creation of Application Specific Topologies in direct response to application requirements. Our Ultragrid testing was conducted over the DRAGON metropolitan ethernet service connecting: University of Southern California Information Sciences Institute (USC/ISI) East (Arlington, Virginia); and University of Maryland (UMD) Mid-Atlantic Crossroads (MAX) in College Park, Maryland.
22 UltraGrid over DRAGON Network Optical switching element UMD MAX CLPK Goddard Space Flight Center GSFC) MIT Haystack Observatory (HAYS) Optical edge device DRAGON ATDNet DCNE ARLG HOPI / NLR MCLN National Computational Science Alliance (NCSA) ACCESS USC/ISI East DCNE
23 UltraGrid over DRAGON Network Optical switching element UMD MAX CLPK Goddard Space Flight Center GSFC) MIT Haystack Observatory (HAYS) Optical edge device DRAGON ATDNet DCNE ARLG HOPI / NLR MCLN National Computational Science Alliance (NCSA) ACCESS USC/ISI East DCNE
24 UltraGrid over DRAGON Network Optical switching element UMD MAX CLPK Goddard Space Flight Center GSFC) MIT Haystack Observatory (HAYS) Optical edge device DRAGON ATDNet DCNE ARLG HOPI / NLR DCNE MCLN National Computational Science Alliance (NCSA) ACCESS USC/ISI East Network tests: Duration: 10 min RTT: 570 µs MTU: 8800 bytes Results: No loss or reordering Mbps throughput Total 10,178,119 packets sent and received
25 Inter-packet Intervals: Sender vs. Recevier
26 Inter-packet Intervals: Sender vs. Recevier
27 Frame inter-display times 1/60 sec m
28 Summary Full rate uncompressed HDTV video conferencing is available today, with current network and end-system technologies. Approximate cost UltraGrid nodes are: Hardware: ~$18000 Software: open source code It is paramount to be able to adapt to differing network technologies and conditions: Full rate 1.2Gbps flows on dedicated networks Network friendly flows on IP best effort networks
29 Further Information UltraGrid project web-site: Latest UltraGrid release available for download UltraGrid-users mailing list subscription information Congestion control for media: Version of Iperf+TFRC for UDP flows, available for download DRAGON network : DRAGON
http://eprints.gla.ac.uk/3585/
Gharai, L. and Lehman, T. and Saurin, A. and Perkins, C. (26) Experiences with high definition interactive video conferencing. In, IEEE International Conference on Multimedia and Expo, 9-12 July 26, pages
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