broadcast television archiving

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Broadcast Television Archiving Rod Hewitt [email protected]

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Broadcast Television Archiving. Rod Hewitt [email protected]. 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 - PowerPoint PPT Presentation

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Page 1: Broadcast Television Archiving

Broadcast Television Archiving

Rod [email protected]

Page 2: Broadcast Television Archiving

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

Page 3: Broadcast Television Archiving

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

Page 4: Broadcast Television Archiving

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!

Page 5: Broadcast Television Archiving

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

Page 6: Broadcast Television Archiving

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

Page 7: Broadcast Television Archiving

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

Page 8: Broadcast Television Archiving

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

Page 9: Broadcast Television Archiving

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

Page 10: Broadcast Television Archiving

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

Page 11: Broadcast Television Archiving

Digital Archiving Examples

• Multiplexes from around the world

Page 12: Broadcast Television Archiving

European Satellite

Page 13: Broadcast Television Archiving

UK Terrestrial

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France Terrestrial

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Finland Terrestrial

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Germany Cable

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Mali Cable

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Dallas,TX Terrestrial

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Columbus, NC Cable

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Brazil Terrestrial

Page 21: Broadcast Television Archiving

Broadcast Television Archiving

Rod [email protected]