Download Digital Video Over IP

Digital Video Over IP
정재훈 ([email protected])
이해원 ([email protected])
서울대학교 멀티미디어 통신 연구실
SNU MMLAB
Contents
• What is Digital Video?
• Applications of Digital Video
– IEEE 1394
– H.323
– Video Charger
• Related Digital Video Issues
• Future Work of APAN-KR
• Conclusion
SNU MMLAB
What is Digital Video?
• Definition
– Representation or encoding of the video signal in
the digital bits for storage, transmission and display
• Category
– Live Transmission, Video Conference ,
Video Broadcasting , Video on Demand
• Characteristics
– Common Protocol Stacks : RTP/UDP/IP
– High Bit Rate : CBR vs VBR
– Long-lived Flows
• Communication
– Unicast vs Multicast
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Application of Digital Video
• Live Transmission (Remote Education)
– IEEE 1394
• Video Conference
– MBone: sdr, vic, vat, nte, wb
– ISABEL
– H.323 : MS NetMeeting, PictureTel
• Video Broadcasting
– IBM Videocharger, RealMedia
• Video on Demand
– IBM Videocharger
SNU MMLAB
IEEE 1394(1/3)
DV Camcoder or
DV recorder deck
DV Camcoder
IEEE1394
IEEE1394
Internet
PC
PC
IEEE1394 Interface card
Network Interface card
Server Application
Server
RTP
IEEE UDP
1394
IP
Ethr
DV stream/IEEE1394
IEEE1394 Interface card
Network Interface card
Client Application
Client
RTP
UDP IEEE
1394
IP
Ethr
DV stream/RTP/UDP/IP/Ethernet
DV stream/IEEE1394
SNU MMLAB
IEEE 1394(2/3)
• Environment
–
–
–
–
OS: FreeBSD-3.4 Release
IEEE 1394 Device Driver: Katsushi Kobayashi
Application Programs: Akimichi Ogawa
http://www.sfc.wide.ad.jp/DVTS/
• Applications
– Live Transmission (http://coral.apan.snu.ac.kr)
– Remote Education
• Distance Education b/w USA & Japan
– Course: Introduction to Computer Networks
– Joining Organizations: WISC, KEIO, NAIST
– Term: 2nd Term, 1999
• Limitation
– Large Bandwidth: 25Mbps(Full rate)
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IEEE 1394(3/3)
• Participant University: SNU, Korea Univ.
• Test Date: 1999.8.2 19:30~22:30
• netperf measurement : +55Mbps
KU Machine 1
SNU Machine 1
SNU ATM Switch
KU ATM Switch
Seoul AP
ATM Switch
SNU Machine 2
ttt
KU Machine 2
mrtg
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H.323(1/2)
• ITU-T standard for multimedia communications
services on packet-switches networks
• Software only
– Microsoft NetMeeting, PictureTel, Intel, MAXPC
• Hardware Assisted
– VCON Escort 25, Zydacron Z350
• MEGACONFERENCE
– A permanent, ongoing multipoint H.323 Internet
video conference
– http://www.mega-net.net/megaconference/
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H.323(2/2)
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IBM VideoCharger(1/8)
Features
• Stored session
– VOD
– Unicast/Multicast
• Live session
– Video Broadcasting, Remote education, …
– Multicast
• FutureTel Primeware or Optibase encoder
– Web-based interface for playback
SNU MMLAB
IBM VideoCharger(2/8)
System Configuration
To Seoul XP
Satellite
MPEG1/2
Encoder
TV
Camcorder
Video Server
Multicast
Router
• MPEG 1/2 Encoder
– FutureTel Primeware NS-325
• Streaming Server
– NT 4.0
– IBM VideoCharger ver 2.0 + service level 4
+ TTL bug patch
• Client
–IBM VideoCharger player ver 2.0
–Windows 95/98/NT
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IBM VideoCharger(3/8)
SNU MPEG Experiment
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IBM VideoCharger(4/8)
MPEG1 Traffic
• Live session
• 3Mbps
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IBM VideoCharger(5/8)
MPEG2 Traffic
• Live session
• 5Mbps
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IBM VideoCharger(6/8)
Remote Education
Multicast
Router
Multicast
Router
Tunnel
VC Server
Tunnel
•A/V : MPEG1/2
(Up to 8Mbps)
•Data : Web,
Powerpoint
Remote Presentation,
NTE, WhiteBoard, ...
Tunnel
Multicast
Router
Multicast
Router
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IBM VideoCharger(7/8)
Current Problem & Future Plan
• VideoCharger problem
– MPEG2 live session playback error
– Unstable
• Future Plan
– MPEG2 live session experiment with VC
– RealServer + Bitcasting MPEG1 plugin experiment
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IBM VideoCharger(8/8)
Related Activities
• Internet2 DVI(Digital Video Initiatives), Digital
Video Network(DVN)
• Research TV
• Video Development Initiative
• iCAIR
• CANARIE, SURFnet, etc.
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Related Digital Video Issues
• Internet2 QBone: DiffServ
• MBone: Multicast
• Internet2 DSI
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Future Work of APAN-KR
• I2-DSI storage services
– support content delivery to local servers
(delegate servers)
– Digital Bitcasting Server
• IBM Research
– developing an I2-DSI-friendly import function to
enable IBM VideoCharger servers to serve as streaming
video delegates
• Future Work
– DSI Service at APAN-KR
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Conclusion
• Next-generation Knowledge in Internet
– Digital video over IP
• Advanced Applications/Users Push Network
Evolutions
– Short Term
• Selection of applications compatible with the target
– Long Term
• Continuous effort to develop the DV applications
• Need to Support Digital Video Applications
– QoS
– Storage
– Multicast
SNU MMLAB