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VIR= Vertical Interval Reference. Remember, TV stations using video had to stay synchronized to the network color burst reference for timing and interchange purposes. Also remember there was Time Code involved for locally produced video content using video tape sources. Known as SMPTE (Society Of Motion Picture and Television Engineers) Time Code. Hope this explains the underlying issues with VIR's use and implementation and allow set owners freedom of their vision and taste in color settings at home.
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