H. Okada

M. Emoto

M. Watanabe

N. Ohno

S. Masuzaki

National Institute for Fusion Science (NIFS-Repository)

ClientEJijoVIDEO CAMERAKyotoUniversityClientClientClientRelay erverClientNagoyaUniversityCompositeNTSCServer ClientCPU Xeon2GHzx2 Pentium 4 2GHzMemory 1GB 1GBas Linux Kernel 2.4 Windows 2000ProfessionalCapture card Bill 878 basedNIC 1000Base-SX 1000Base-TCaptur ServerClientFig2. Cascade connection of the servers. The relay server receivethe motional images from the upstream, and forwards them todownstreamReference1) Emoto, M., et. aI., Rev. Sci. Inst., 74,(2003), pp.17662) Shoji, M., et. ai, PCaPAC2000, Hamburg, Oct. 20003) http://www.sinet.adjp/Table I: The specifications of the servers and clientsFig. 1. The overview of the video streaming systemSmooth cooperative research requires effective remoteparticipation. To this end, NIPS (National Institute for FusionScience) has enhanced its network among domestic institutes.The new network, called the Super SINET [2] (ScienceInformation Network), connects national universities andgovernmental organizations and has a lOG bps backbone. NIPSconnected Kyoto University and Nagoya University to thisnetwork at a speed of 1 G bps each way in 2002, and plans toconnect other universities. The author developed a new video-streaming server to send non-compressed images between NIPSand Nagoya University and Kyoto University. Motional imagedata can help researchers recognize dynamic behavior of plasmasuch as plasma-wall interactions and impurity transport in theplasma periphery. It is common way to send video streaming bythe limited network as lossy compressed format likeRealVideo™, MPEG, QuickTime™, and the like. Shojideveloped Video on Demand system for LHD experiments [3],and the system uses MPEG-I or MPEG2 formats and providesthem by the network to monitor plasma behavior. These formatuses lossy algorithm that removes insignificant information fromthe original data. The reason because the lossy algorithm is usedis that it is convenient to send images by limited bandwidthnetwork like the Internet. For example, sending VGA size image30 times per second requires the bandwith of 26MB/s, and thebandwidth is far from the capability of the normal network.These data can be used for entertainment purpose, but it cannotbe used for research. Therefore, until SuperSINET is available, itis not realistic to send non-compressed motional images betweenuniversities. The network bandwodth of the new networkbetween NIPS and the universies is 1Gbps, it is high enough tosend non compressed images.Fig.l. shows the system overview of this system. Thespecification of the server and client PC are listed in table 1. Theservers and client uses two TCP/IP ports to communicate witheach other. The clients connect to the server using the controlport, and demand that the server start or stop streaming data. Thesource of the image is captured from the composite signal usingNTSC format.The main characteristic of this system is extensible by thecascade connection (Fig.2 ). The relay server locates between thecapture server and the client, it receives the video image from theupper stream, and provides it for the two or more downstreamservers or clients. By increasing the number of layers, the numberof the clients can be unlimited.§ 19. High Quality Video Streaming Systemfor Plasma Diagnostic Using SuperSINETEmoto, M., Watanabe, M., Masuzaki, S.Ohno, N. (Nagoya Univ.)Okada, H. (lnst. Adv. Eng., Kyoto Univ.)168

High Quality Video Streaming System for Plasma Diagnostic Using Super SINET

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