1 / 19

Spring 2002 Internet2 Member Meeting

This article discusses the technical challenges and delivery format options for high quality video distribution, focusing on the use of MPEG-2. It also explores the offerings of the Research Channel, including live streaming and video-on-demand services. Additionally, it highlights the potential of MPEG-4 for better compression and video quality. Questions? Visit www.internet2.edu.

gordonr
Télécharger la présentation

Spring 2002 Internet2 Member Meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Spring 2002 Internet2 Member Meeting High Quality Video Distribution:  Latest Technologies

  2. Who we are • Steve Smith • University of Alaska • Egon Verharen • SURFnet • Andy Herron • University of Washington • Research Channel

  3. “High Quality Video” • What we’re talking about: • “Video that is as good as or better than commercially broadcast video.”

  4. Technical Challenges • What makes high quality video challenging: • Storage requirements • Network bandwidth • Client performance • Client complexity

  5. Delivery Format Options • MPEG-2 • MPEG-4 • Proprietary (based on MPEG-4) • Windows Media • Real • Others

  6. Why we choose MPEG-2 • Standards based • Used in video production • Wide variety of commercial products available • Good client rendering support • Software codecs for fast machines • Reasonably priced accelerator cards for slow machines • Reasonably efficient compression

  7. Research Channel Offerings • MPEG-2 Multicast at 10 mbps • MPEG-2 V.O.D. at 5.6 mbps • HD-TV (MPEG2 HL) at 19.2 mbps • HD-TV (Sony HDCAM) at > 220 mbps

  8. 10 mbps MPEG-2 Live Stream • Research Channel live broadcast • Multicast for efficient use of bandwidth • Amnis (aka Optivision) set top boxes • NAC 3000 & NAC 4000 • Easy to setup and maintain • Quite stable if network not congested • Converts from NTSC to PAL if required • Each channel needs dedicated sender • Software client available

  9. 5.6 mbps MPEG-2 Video On Demand • IBM Video Charger servers • Streams on Isilon NAS farm (1.5 terabytes per box ) • NAS allows all streaming servers to access the same content. Disk space is shared across streaming servers. • NAS has lower throughput than SAN due to Windows SMB client • Roughly 40 megabytes/minute storage • Protocol is RTSP with UDP delivery • Linux and Mac clients in the works by IBM

  10. 5.6 mbps MPEG-2 Video On Demand (continued) • IBM Video Charger client • Software decode • PC DVD players include MPEG-2 decoder • Shareware Elecard software decoder available at www.elecard.com (use v1.35) • Hardware decode • Netstream 2000 • Sigma Designs X-Card (can render in 1080i)

  11. 19.2 mbps MPEG-2 HD-TV Video On Demand • Content is encoded as ATSC compliant HDTV transport stream at 19.2 mbps • Same Video Charger server backend as 5.6 mbps content • Low load on server when sending (~ 4% CPU on 1.1 Ghz PIII ) • Roughly 142 megabytes/minute storage

  12. 19.2 mbps MPEG-2 Client Options • Hardware HD tuner cards can be used • Telemann HiPix DTV-200 • Macro Image Technology MDP-100 • Hauppauge WinTV-HD • Severe problems when used as decoders but will mature • Software decode requires *fast* PC • 2.8 Ghz P4 with 1066 RDRAM barely does the job • Should get easier over time with 8x AGP, 3+ Ghz P4 • Have not tried multiprocessor system yet

  13. 19.2 mbps MPEG-2 HD Client • Over time : • Hardware decoders will mature allowing current PCs to display HD • Processors will get faster to support software decode of HD

  14. HD-TV at 220 mbps • Sony proprietary HDCAM format • Production quality video (1080 60i 30fps) • Loss-less compression of data on HD tape • Audio/Video data rate is ~155 mbps on tape

  15. HDCAM over the Internet • HD tape deck out via SDTI (270 mbps) to PC-based Optibase VideoPump card • Data transferred to server’s striped disk volume • On demand sent over the net at 220 mbps • Receiver PC passes data to Sony HDCAM decoder via VideoPump card in SDTI format. • Decoder then renders signal to analog audio/video signal

  16. HDCAM over the Internet • Roughly 1.65 gigabytes/minute storage • Rather expensive equipment required • May be some time before Gig-Ethernet to the desktop is a reality • 19.2 MPEG-2 encoded HD is more practical

  17. MPEG-4 Challenges and Opportunities • Better compression than MPEG-2 • Better video at same bandwidth • Less bandwidth at same video quality • More computing power required • Client capable of decoding MPEG-2 5.6 in software may have problems decoding MPEG-4 at equivalent video quality • Accelerator cards will solve this problem • Lack of MPEG-4 HD encoders • MPEG-4 per-stream royalty

  18. Questions?

  19. www.internet2.edu

More Related