An object moving vertically uniformly in the original video will spend twice as much time on a line that was blended from two lines compared with on a line that was not affected by the downconversion or upconversion. Progressive Scan Players Can Do Better Beginning in 1999, progressive scan DVD players started to appear on the market in quantity. These players construct an entire 480 line video frame before sending it to the TV which must be capable of accepting it. With the entire video field on hand we don't have the problem of dropping two scan lines in a row. Quality varies with make and model of DVD player.
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