![]() Many media, including broadcasting by radio, a magnetic cassette, optical disks, electronic files, and network streaming, have analog and digital variants. Display resolution, aspect ratio, refresh rate, color capabilities, and many other qualities differ in video systems. The first invention for the footage was mechanical TV systems, rapidly replacing cathode ray tube (CRT) systems and subsequent replacements of several kinds of flat panel displays. Video is an interactive medium that records, copies, reproduces, broadcasts, and views the visual media moving.
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