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Broadcast Television Archiving

Broadcast Television Archiving. Rod Hewitt rod@coolstf.com. Current System. Analog input-based Encodes to MPEG-2 Program Stream files Initially DLT tape based Now uses removable 3.5 inch drives Operational since 2000. Current System. Records up to twenty channels on five PCs

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Broadcast Television Archiving

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  1. Broadcast Television Archiving Rod Hewitt rod@coolstf.com

  2. Current System • Analog input-based • Encodes to MPEG-2 Program Stream files • Initially DLT tape based • Now uses removable 3.5 inch drives • Operational since 2000

  3. Current System • Records up to twenty channels on five PCs • Content from around the world • More than half of these channels have EPG • US and Canadian channels have captions • Operates at a house in suburban MD

  4. Current System Issues • Analog based • Recodes video that comes in digital • Caption data is lost in recordings (kept as text) • Expensive to expand • A big chunk stops working in February 2009!

  5. Digital Future • The future of broadcasting is digital • One big lesson learned: • Needs to be geographically redundant • …and therefore inexpensively implemented • …and inexpensive to run long term

  6. MPEG-2 Transport Stream • The worldwide standard for broadcast DTV • A single analog channel is replaced with a digital multiplex • The multiplex can contain one or more programs • Encoded with different codecs • With multiple audio and data streams

  7. Digital Archiving • Splits programs from MPEG-2 transport streams • One tuner required per multiplex • Multiplex may contain a number of useful programs or just one • Transparent across the world’s DTV standards • Works with terrestrial, satellite and cable

  8. Digital Archiving • Splits files based on EPG or a timer • EPG from in or outside the multiplex • Extracts captions in North America • Extracts subtitles in some European countries • Generates thumbnail pictures of video • Automatically moves data onto empty drives • XML index to each event recorded

  9. Hardware is cheap! • For two channel terrestrial: • PC - $400 • Monitor - $150 • Two off-air DVB-T or ATSC cards - $200 • UPS - $200 • Antenna - $50 • Around $1000 per system

  10. Storage is cheap! • 1 TB SATA drives are now typically $179 • With MPEG-2 SD, that’s 23 days • …or 46 days with H.264 SD • …and 6 days MPEG-2 HD • About $8 per channel per MPEG-2 SD day • Two MPEG-2 SD per year for less than $7000

  11. Digital Archiving Examples • Multiplexes from around the world

  12. European Satellite

  13. UK Terrestrial

  14. France Terrestrial

  15. Finland Terrestrial

  16. Germany Cable

  17. Mali Cable

  18. Dallas,TX Terrestrial

  19. Columbus, NC Cable

  20. Brazil Terrestrial

  21. Broadcast Television Archiving Rod Hewitt rod@coolstf.com

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