Broadcast Television Archiving Rod Hewitt

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Presentation transcript:

Broadcast Television Archiving Rod Hewitt

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 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

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!

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

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

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

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

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

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

Digital Archiving Examples Multiplexes from around the world

European Satellite

UK Terrestrial

France Terrestrial

Finland Terrestrial

Germany Cable

Mali Cable

Dallas,TX Terrestrial

Columbus, NC Cable

Brazil Terrestrial

Broadcast Television Archiving Rod Hewitt

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