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Strategies for Deploying Digital Video Architectures: Key Considerations and Drivers

This presentation by Mike Hochman discusses the vital components of deploying digital video architectures, including system drivers, encoding formats, and ad insertion technologies. It covers the transition from analog to all-digital services, emphasizing the significance of constant bitrate (CBR) and variable bitrate (VBR) encoding methods. Key topics include digital simulcast, edge expansion, and the implications for service quality and user experience. The outline serves as a guide for choosing suitable architectures and partners for successful deployment.

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Strategies for Deploying Digital Video Architectures: Key Considerations and Drivers

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Presentation Transcript

  1. Deploying DigitalDrivers,Architectures,and ConsiderationsMike Hochman2008 CCTA Annual MeetingSan Juan, PR

  2. Outline • System architectures and drivers • Simulcast • Edge Expansion • All-Digital • Encoding architectures • Constant bitrate (CBR) • Variable bitrate (VBR) • Ad insertion • Locally generated channels • Considerations for choosing the correct architecture and partner

  3. Typical analog cable system 450 – 550 MHz 60-80 channels Analog “scrambling” & traps No HD, VOD, etc. Analog receivers Analog modulators Node Fiber/HFC Coaxial Combiner IRD Receiver Decoder

  4. Digital Simulcast • Increase digital services • Enhance user experience • Maintain high quality • Discerning viewers • Large screen TVs

  5. Multiplexing & Modulation Encoders Digital Simulcast Piracy protection on digital channels Digital video quality Lower cost all-digital set top Foundation for HD, VOD ~ $3,000 per channel Analog receivers Analog modulators Node Fiber/HFC Coaxial Combiner IRD Receiver Decoder

  6. Multiplexing & Modulation Encoders Analog modulators Edge QAM Combiner Decoders Edge Expansion Expanded plant bandwidth Interactive applications VOD Switched Digital Video ~ $500 / channel / node Analog receivers Node Fiber/HFC Coaxial IRD Receiver Decoder

  7. Multiplexing & Modulation Encoders Decoders All-Digital All-digital network Complete piracy protection “Unlimited” bandwidth $50 - $300 per set top box Analog receivers Node Fiber/HFC Coaxial Edge QAM IRD Receiver Decoder

  8. Architectures $ Simulcast Analog & digital throughout the network ~ $3,000 per channel Edge Expansion Decoding and modulation at the edge Additional ~$500 - $1000 per channel per node All-digital Complete piracy protection Bandwidth for future growth $$ $$$ Flexible platforms enable seamless migration

  9. Encoding Architectures

  10. Constant Bit Rate • Fixed transport bitrate • Fixed video bitrate • Fixed audio bitrate • Video quality varies dependent on content • Constant across program mix

  11. All-CBR Architecture Modulation Encoding

  12. Variable Bit Rate • Target bit rate range (min, max) • Target video quality • Bit rate changes to achieve target • Varies with time • Varies across program mix

  13. Variable Bit Rate “Easy” content: • News channels • Cartoons “Difficult” content: • Sports action • Quick scene changes

  14. Open-loop VBR Encoding Rate-Shaping Modulation

  15. Closed-loopVBR Closed-loop controller Bit rate assignments Complexity estimates Modulation Encoding

  16. IP IP Distributed Closed-loop Region 2 Closed-loop controller Region 1 Modulation Encoding

  17. Closed-loop VBR $$$$$$ 16 ch. per QAM Open-loop VBR Rate-shaped $$$ Rate- shaper 14 ch. per QAM Open-loop CBR Rate-shaped $$ Rate- shaper 12 ch. per QAM Open-loop CBR Not rate-shaped $ 10-11 ch. per QAM CBR, VBR, Open, Closed, Rate-shaped

  18. Ad Insertion • Maintain existing analog ad insertion system and encode after insertion • Low Cost • Harder to manage • Reduced video quality • Digital Program Insertion • Ads stay digital • Are usually CBR • Easier to manage • Higher video quality

  19. Ad Splicing SCTE 35 Encoder Mux/Splicer QAM Ad stream Network Cue tones DTMF, Contact Closure, or SCTE 104 SCTE 30 CATV Network Ad Server

  20. Locally Generated Content • If you wish to deploy all-digital set-tops, EVERYTHING must be digital • MDU in-house channels • Hotels • Hospitals • Stadiums

  21. Community Cameras Encoding, Multiplexing, Modulation and Up Conversion Locally Generated Content Analog receivers Analog Fiber Node Ad Servers Without digital set top Edge Decoding Groomer/Mux Optical IP transport Off-air ENCORE Encoders Splicer/Mux Modulation QUARTET Encoders With digital set top Digital Fiber Node Digital receivers Community Cameras MDU encoding, multiplexing, modulation and up conversion

  22. Criteria for partner selection • Video quality • Channels per QAM • Ease of deployment and maintenance • Cost • Digital ad-insertion • Upgradeability, flexibility • Work with partners that have experience, and proven success interoperating with each other

  23. Thank You

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