DVD Region 2 - Roswell: Complete Seasons 1-3 (17 Disc Set) - Video & DVD

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1. DVD-Video discs require a DVD-drive with a MPEG-2 decoder (e.g. a DVD-player or a DVD computer drive with a software DVD player). Commercial DVD movies are encoded using a combination of MPEG-2 compressed video and audio of varying formats (often multi-channel formats as described below). Typical data rates for DVD movies range from 3–10 Mbit/s, and the bit rate is usually adaptive. The video resolution on NTSC discs is 720 × 480 and on PAL discs is 720 × 576. A high number of audio tracks and/or lots of extra material on the disc will often result in a lower bit rate (and image quality) for the main feature.

2. Although experimental recordings exist from the 1960s, digital recording of classical and jazz music began to be made commercially in the early 1970s, pioneered by Japanese companies such as Denon; the first 16-bit PCM recording in the United States was made by Thomas Stockham at the Santa Fe Opera in 1976 on a Soundstream recorder. In most such cases, there was no mixing stage involved; a stereo digital recording was made and used unaltered as the master tape for subsequent commercial release. These, and other subsequent unmixed digital recordings are still described as DDD, as the technology involved is purely digital. (Likewise, unmixed analog recordings are usually described as ADD, to denote a single generation of analog recording).