Etymology[ edit ] The Oxford English Dictionary comments that, "In rival manufacturers of the product initially named digital video disc agreed that, in order to emphasize the flexibility of the format for multimedia applications, the preferred abbreviation DVD would be understood to denote digital versatile disc. There were several formats developed for recording video on optical discs before the DVD. Optical recording technology was invented by David Paul Gregg and James Russell in and first patented in A consumer optical disc data format known as LaserDisc was developed in the United States , and first came to market in Atlanta, Georgia in It used much larger discs than the later formats.
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DVD-Video - Wikipedia
Widescreen video is supported only in D-1 resolutions. Content with a frame rate different from one of the rates shown above can be encoded to H. This is most commonly used to encode Pulldown can be implemented directly while the disc is mastered, by actually encoding the data on the disc at Alternately, the content can be encoded on the disc itself at one of several alternate frame rates, and use flags that identify scanning type, field order and field repeating pattern. Such flags can be added in video stream by the H. A DVD player uses these flags to convert progressive content into interlaced video in real-time during playback, producing a signal suitable for interlaced TV sets.