20021030-Video-Herron.ppt

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  • This is a general overview presentation about Internet2. Internet2 is a consortium, led by US universities, which is recreating the partnership among academia, industry and government that fostered today’s Internet in its infancy.
  • 20021030-Video-Herron.ppt

    1. 1. Spring 2002 Internet2 Member Meeting High Quality Video Distribution:  Latest Technologies
    2. 2. Who we are <ul><li>Steve Smith </li></ul><ul><ul><li>University of Alaska </li></ul></ul><ul><li>Egon Verharen </li></ul><ul><ul><li>SURFnet </li></ul></ul><ul><li>Andy Herron </li></ul><ul><ul><li>University of Washington </li></ul></ul><ul><ul><li>Research Channel </li></ul></ul>
    3. 3. “High Quality Video” <ul><li>What we’re talking about: </li></ul><ul><li>“Video that is as good as or better than commercially broadcast video.” </li></ul>
    4. 4. Technical Challenges <ul><li>What makes high quality video challenging: </li></ul><ul><li>Storage requirements </li></ul><ul><li>Network bandwidth </li></ul><ul><li>Client performance </li></ul><ul><li>Client complexity </li></ul>
    5. 5. Delivery Format Options <ul><li>MPEG-2 </li></ul><ul><li>MPEG-4 </li></ul><ul><li>Proprietary (based on MPEG-4) </li></ul><ul><ul><li>Windows Media </li></ul></ul><ul><ul><li>Real </li></ul></ul><ul><li>Others </li></ul>
    6. 6. Why we choose MPEG-2 <ul><li>Standards based </li></ul><ul><li>Used in video production </li></ul><ul><ul><li>Wide variety of commercial products available </li></ul></ul><ul><li>Good client rendering support </li></ul><ul><ul><li>Software codecs for fast machines </li></ul></ul><ul><ul><li>Reasonably priced accelerator cards for slow machines </li></ul></ul><ul><li>Reasonably efficient compression </li></ul>
    7. 7. Research Channel Offerings <ul><li>MPEG-2 Multicast at 10 mbps </li></ul><ul><li>MPEG-2 V.O.D. at 5.6 mbps </li></ul><ul><li>HD-TV (MPEG2 HL) at 19.2 mbps </li></ul><ul><li>HD-TV (Sony HDCAM) at > 220 mbps </li></ul>
    8. 8. 10 mbps MPEG-2 Live Stream <ul><li>Research Channel live broadcast </li></ul><ul><li>Multicast for efficient use of bandwidth </li></ul><ul><li>Amnis (aka Optivision) set top boxes </li></ul><ul><ul><li>NAC 3000 & NAC 4000 </li></ul></ul><ul><ul><li>Easy to setup and maintain </li></ul></ul><ul><ul><li>Quite stable if network not congested </li></ul></ul><ul><ul><li>Converts from NTSC to PAL if required </li></ul></ul><ul><li>Each channel needs dedicated sender </li></ul><ul><li>Software client available </li></ul>
    9. 9. 5.6 mbps MPEG-2 Video On Demand <ul><li>IBM Video Charger servers </li></ul><ul><ul><li>Streams on Isilon NAS farm (1.5 terabytes per box ) </li></ul></ul><ul><ul><li>NAS allows all streaming servers to access the same content. Disk space is shared across streaming servers. </li></ul></ul><ul><ul><li>NAS has lower throughput than SAN due to Windows SMB client </li></ul></ul><ul><li>Roughly 40 megabytes/minute storage </li></ul><ul><li>Protocol is RTSP with UDP delivery </li></ul><ul><li>Linux and Mac clients in the works by IBM </li></ul>
    10. 10. 5.6 mbps MPEG-2 Video On Demand (continued) <ul><li>IBM Video Charger client </li></ul><ul><li>Software decode </li></ul><ul><ul><li>PC DVD players include MPEG-2 decoder </li></ul></ul><ul><ul><li>Shareware Elecard software decoder available at www.elecard.com (use v1.35) </li></ul></ul><ul><li>Hardware decode </li></ul><ul><ul><li>Netstream 2000 </li></ul></ul><ul><ul><li>Sigma Designs X-Card (can render in 1080i) </li></ul></ul>
    11. 11. 19.2 mbps MPEG-2 HD-TV Video On Demand <ul><li>Content is encoded as ATSC compliant HDTV transport stream at 19.2 mbps </li></ul><ul><li>Same Video Charger server backend as 5.6 mbps content </li></ul><ul><ul><li>Low load on server when sending (~ 4% CPU on 1.1 Ghz PIII ) </li></ul></ul><ul><li>Roughly 142 megabytes/minute storage </li></ul>
    12. 12. 19.2 mbps MPEG-2 Client Options <ul><li>Hardware HD tuner cards can be used </li></ul><ul><ul><li>Telemann HiPix DTV-200 </li></ul></ul><ul><ul><li>Macro Image Technology MDP-100 </li></ul></ul><ul><ul><li>Hauppauge WinTV-HD </li></ul></ul><ul><ul><li>Severe problems when used as decoders but will mature </li></ul></ul><ul><li>Software decode requires *fast* PC </li></ul><ul><ul><li>2.8 Ghz P4 with 1066 RDRAM barely does the job </li></ul></ul><ul><ul><li>Should get easier over time with 8x AGP, 3+ Ghz P4 </li></ul></ul><ul><ul><li>Have not tried multiprocessor system yet </li></ul></ul>
    13. 13. 19.2 mbps MPEG-2 HD Client <ul><li>Over time : </li></ul><ul><li>Hardware decoders will mature allowing current PCs to display HD </li></ul><ul><li>Processors will get faster to support software decode of HD </li></ul>
    14. 14. HD-TV at 220 mbps <ul><li>Sony proprietary HDCAM format </li></ul><ul><li>Production quality video (1080 60i 30fps) </li></ul><ul><li>Loss-less compression of data on HD tape </li></ul><ul><li>Audio/Video data rate is ~155 mbps on tape </li></ul>
    15. 15. HDCAM over the Internet <ul><li>HD tape deck out via SDTI (270 mbps) to PC-based Optibase VideoPump card </li></ul><ul><li>Data transferred to server’s striped disk volume </li></ul><ul><li>On demand sent over the net at 220 mbps </li></ul><ul><li>Receiver PC passes data to Sony HDCAM decoder via VideoPump card in SDTI format. </li></ul><ul><li>Decoder then renders signal to analog audio/video signal </li></ul>
    16. 16. HDCAM over the Internet <ul><li>Roughly 1.65 gigabytes/minute storage </li></ul><ul><li>Rather expensive equipment required </li></ul><ul><li>May be some time before Gig-Ethernet to the desktop is a reality </li></ul><ul><li>19.2 MPEG-2 encoded HD is more practical </li></ul>
    17. 17. MPEG-4 Challenges and Opportunities <ul><li>Better compression than MPEG-2 </li></ul><ul><ul><li>Better video at same bandwidth </li></ul></ul><ul><ul><li>Less bandwidth at same video quality </li></ul></ul><ul><li>More computing power required </li></ul><ul><ul><li>Client capable of decoding MPEG-2 5.6 in software may have problems decoding MPEG-4 at equivalent video quality </li></ul></ul><ul><ul><li>Accelerator cards will solve this problem </li></ul></ul><ul><li>Lack of MPEG-4 HD encoders </li></ul><ul><li>MPEG-4 per-stream royalty </li></ul>
    18. 18. <ul><li>Questions? </li></ul>
    19. 19. www.internet2.edu

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