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Digital Video and HD, 2nd Edition by Charles Poynton

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16

Introduction to video compression

Directly storing or transmitting digital video requires fairly high data capacity – about 20 megabytes per second for SD, or about 120 megabytes per second for HD. Here is a rule of thumb that relates storage capacity and data rate: Eight, 2000-ft reels of motion picture print film can carry a 133 1/3 minute movie; there are 8 bits in a byte and 60 seconds in a minute; and 60/8·1331/3is 1000. So one megabit per second equals one gigabyte per movie – whether compressed or not! Similarly, one gigabit per second equals one terabyte per movie.

A rule of thumb that relates data rate to storage capacity:

Mb/s = GB/movie

Gb/s = TB/movie

Economical storage or transmission requires compression. This chapter introduces ...

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