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In 1951 the first video tape recorder captured live images from television cameras by converting the camera's electrical impulses and saving the information onto magnetic video tape.Video recorders were sold for US $50,000 in 1956, and videotapes cost US $300 per one-hour reel.The use of digital techniques in video created digital video, which allows higher quality and, eventually, much lower cost than earlier analog technology.After the invention of the DVD in 1997 and Blu-ray Disc in 2006, sales of videotape and recording equipment plummeted.



Ja neesi apmierināts ar Flash Player funkcionalitāti uz Tava datora, lūdzu - pamēģini pārslēgties uz HTML-5 lapas versiju nospiežot "slēdzi".In interlaced video, the horizontal scan lines of each complete frame are treated as if numbered consecutively, and captured as two fields: an odd field (upper field) consisting of the odd-numbered lines and an even field (lower field) consisting of the even-numbered lines.Analog display devices reproduce each frame, effectively doubling the frame rate as far as perceptible overall flicker is concerned.Analog and digital variants exist and can be carried on a variety of media, including radio broadcast, magnetic tape, optical discs, computer files, and network streaming.

Video technology was first developed for mechanical television systems, which were quickly replaced by cathode ray tube (CRT) television systems, but several new technologies for video display devices have since been invented.

The minimum frame rate to achieve a comfortable illusion of a moving image is about sixteen frames per second. In progressive scan systems, each refresh period updates all scan lines in each frame in sequence.