Thanks for digging out the VideoHelp thread, I went over it quickly, but I could not reproduce the findings.
My sources are always 8-bit with 4:2:0 chroma. And the conversion from HEVC HD to AVC SD keeps the video this way. No dithering involved, and the color space also stays the same.
Also I only convert films, no anime. I went over some of my conversions which used ColorMatrix carefully, and I could not detect any color artifacts. So my only valid reason to ditch ColorMatrix and use z_ConvertFormat instead would be a better MT speed, and right now I do not get this.
Cheers
manolito
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