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Video from DVD sometimes contains visible artifacts such as color banding, blurriness, blockiness, fuzzy dots, shimmering, missing detail, and even effects such as a face that "floats" behind the rest of the moving picture.
As compression experience and technology improves we see increasing quality, but as production costs decrease and DVD authoring software becomes widely available we also see more shoddily produced discs.
A few low-budget DVDs even use MPEG-1 encoding (which is no better than VHS) instead of higher-quality MPEG-2.
He writes articles and columns about DVD for publications such as Widescreen Review and serves as Chairman of the IDMA/DVD Association.
Jim was formerly DVD Evangelist at Microsoft, and is currently Chief Technologist at Sonic Solutions, the leading developer of DVD and BD creation software. It's an optical disc storage technology for video, audio, and computer data.
DVD video is usually encoded from digital studio master tapes to MPEG-2 format.
The encoding process uses lossy compression that removes redundant information (such as areas of the picture that don't change) and information that's not readily perceptible by the human eye.
The resulting video, especially when it is complex or changing quickly, may sometimes contain visual flaws, depending on the processing quality and amount of compression.
At average video data rates of 3.5 to 6 Mbps (million bits/second), compression artifacts may be occasionally noticeable.
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