Powerpoint presentation by Pierre Thiry on IPTV


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Powerpoint presentation by Pierre Thiry on IPTV

  1. 1. IPTV: Becoming a reality Pierre Thiry CNIT Instructor ICONS P.I.
  2. 2. Outline <ul><li>Cable TV system: </li></ul><ul><ul><li>Live TV : Radio Frequency channels </li></ul></ul><ul><ul><li>Video-on-demand: DVB (Digital Video Broadcasting) </li></ul></ul><ul><li>Definition of IPTV : free and fee-based </li></ul><ul><li>How fee-based IPTV works: </li></ul><ul><ul><li>Encoding at the head end:MPEG2 & MPEG4 </li></ul></ul><ul><ul><li>IP packets </li></ul></ul><ul><ul><li>Distribution and Reception: </li></ul></ul><ul><ul><ul><li>Live TV: IGMP v2 </li></ul></ul></ul><ul><ul><ul><li>Video-on-demand: RTSP </li></ul></ul></ul><ul><ul><li>Challenges and present state in the US </li></ul></ul>
  3. 3. How present cable TV works <ul><li>Live TV needs a tuner to select the proper channel </li></ul><ul><li>Video on demand uses the Digital Video Broadcast (DVB) protocol </li></ul><ul><li>Cable TV uses fiber-optic cable to transmit to the neigborhood and use coaxial cable to connect to the home </li></ul>
  4. 4. Definition of IPTV: Free IPTV <ul><li>Free IPTV: according to Wikipedia, as of June 2006, there are over 1,300 free IPTV channels available. </li></ul><ul><li>All you need is an Internet connection and a PC, an iPOD or a 3Gcell phone with the proper streaming software </li></ul><ul><li>Most TV stations have now a Free IPTV web site </li></ul>
  5. 5. Video Compression formats: <ul><li>MPEG-1 (Video CDs) progressive Data rates were limited to 1.8 Mbps (1996) </li></ul><ul><li>(MP3 is the audio encoding of MPEG-1) </li></ul><ul><li>MPEG-2 (DVD, Digital TV) interlaced Data rates are from 1.5 to 60 Mbps (2000) </li></ul><ul><ul><li>Two container formats: </li></ul></ul><ul><ul><ul><li>Transport Stream: for broadcasting (ASTC & DVB) </li></ul></ul></ul><ul><ul><ul><li>Program Stream: for DVD abd Super Video CD </li></ul></ul></ul>
  6. 6. Video Compression formats: <ul><li>MPEG-4 (All Inclusive and Interactive) based on Quicktime, including low-bandwidth formats for transmitting to wireless devices as well as high-bandwidth for studio processing </li></ul><ul><li>. MPEG-4 AAC (advanced audio coding) is widely used as an audio-only format (replaces MP3) </li></ul><ul><li>MPEG-4 AVC (or H.264) is the new standard for video transmission. </li></ul>
  7. 9. Distribution & Reception <ul><li>Multicast protocol: from national headend to the local office: needs powerful routers </li></ul><ul><li>Bottleneck at the local office: </li></ul><ul><ul><li>DSL is limited in bandwidth (up to 3Mbps) </li></ul></ul><ul><ul><li>The new ADSL+ will go up to 25Mbps </li></ul></ul><ul><li>Solution: use IGMP v2 from the set-top box to ask for a given channel. The set-top box is an IP receiver. </li></ul>
  8. 10. Quality of Service <ul><li>Between the headend and the local office: </li></ul><ul><ul><li>Error correction mesures for the multicast streams </li></ul></ul><ul><li>Between the local office and the set-top box: since it is unicast , it is not a problem, the system can request a resend of lost packets. </li></ul>
  9. 11. IPTV Video-on-demand <ul><li>Real Time Streaming Protocol enables DVD-style control (pause, fast forward..) over a multimedia stream. </li></ul><ul><li>Limit on the number of simultaneous channels: </li></ul><ul><ul><li>For SDTV maximum of 10 channels </li></ul></ul><ul><ul><li>For HDTV maximum of 2 channels if MPEG-2 is used. More if MPEG-4 is used. </li></ul></ul><ul><li>Advantage of the fiber to the home. </li></ul>
  10. 12. Example of IPTV abroad <ul><li>Hong Kong and China: PCCW </li></ul><ul><li>http://en.wikipedia.org/wiki/Pacific_Century_Cyberworks </li></ul><ul><li>http:// www.nowbroadbandtv.com /eng/ </li></ul><ul><li>More than 300,000 subscribers </li></ul>
  11. 13. In the US: AT&T and Verizon <ul><li>AT&T – project Lightspeed : 40,000 mile rollout of fiber. Not all the way to the home. ( limited by ADSL performance 3Mbps) </li></ul><ul><li>Verizon offer 300+ channels of TV over Fiber to the home ( 4.5 Gbps – 3.5 Gbps for TV ) </li></ul>
  12. 14. Telco vs Cable <ul><li>Telco have won recently a battle from the FCC to allow franchise agreements to be negotiated by state. </li></ul><ul><li>If Telco companies can compete with the cable that will mean cheaper services for the customer. </li></ul><ul><li>Cable companies are looking also at IP to upgrade their services. </li></ul>