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just by curiosity does it will harm the final output if u apply this filter on HDTV source
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I got a few hdtv sources. Marjority of them uses mpeg2 coefficients (checked with the newest GSpot). So, you should also use the filter on those sources.
However, a few of them uses mpeg1 coefficients. You shouldn't apply the filter on those.
Here, you shouldn't use this filter. DivX/XviD assume mpeg1 coefficients when decoding to RGB.
edit: btw, hdtv is YUV [0,255] of course. So you need to use ColorYUV("PC->TV") first.