1. SNU MMLAB Digital Video Over IP 정재훈 (paul@mmlab.snu.ac.kr) 이해원 (hwlee@mmlab.snu.ac.kr) 서울대학교 멀티미디어 통신 연구실

2. 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

3. 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

4. SNU MMLAB 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

5. SNU MMLAB IEEE 1394(1/3) Internet DV Camcoder DV Camcoder or DV recorder deck IEEE1394 PC IEEE1394 Interface card Network Interface card Server Application IEEE1394 Interface card Network Interface card Client Application Server IEEE 1394 UDP IP Ethr Client IEEE 1394 UDP IP Ethr DV stream/RTP/UDP/IP/EthernetDV stream/IEEE1394 RTP

6. 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)

7. SNU MMLAB IEEE 1394(3/3) SNU ATM Switch KU ATM Switch Seoul AP ATM Switch SNU Machine 1 SNU Machine 2 KU Machine 1 KU Machine 2 Participant University: SNU, Korea Univ. Test Date: 1999.8.2 19:30~22:30 netperf measurement : +55Mbps tttmrtg

8. SNU MMLAB 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/

9. SNU MMLAB H.323(2/2)

10. SNU MMLAB IBM VideoCharger(1/8) Stored session –VOD –Unicast/Multicast Live session –Video Broadcasting, Remote education, … –Multicast FutureTel Primeware or Optibase encoder –Web-based interface for playback Features

11. SNU MMLAB IBM VideoCharger(2/8) 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 Camcorder Satellite MPEG1/2 Encoder Video Server Multicast Router To Seoul XP TV System Configuration

12. SNU MMLAB IBM VideoCharger(3/8) SNU MPEG Experiment

13. SNU MMLAB IBM VideoCharger(4/8) Live session 3Mbps MPEG1 Traffic

14. SNU MMLAB IBM VideoCharger(5/8) Live session 5Mbps MPEG2 Traffic

15. SNU MMLAB IBM VideoCharger(6/8) VC Server Tunnel Multicast Router Multicast Router Multicast Router Multicast Router A/V : MPEG1/2 (Up to 8Mbps) Data : Web, Powerpoint Remote Presentation, NTE, WhiteBoard,... Remote Education

16. SNU MMLAB IBM VideoCharger(7/8) VideoCharger problem –MPEG2 live session playback error –Unstable Future Plan –MPEG2 live session experiment with VC –RealServer + Bitcasting MPEG1 plugin experiment Current Problem & Future Plan

17. SNU MMLAB IBM VideoCharger(8/8) Internet2 DVI(Digital Video Initiatives), Digital Video Network(DVN) Research TV Video Development Initiative iCAIR CANARIE, SURFnet, etc. Related Activities

18. SNU MMLAB Related Digital Video Issues Internet2 QBone: DiffServ MBone: Multicast Internet2 DSI

19. SNU MMLAB 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

20. SNU MMLAB 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