You are referring to digital conversion?

Yes.

I don't see that there would be any need for digital conversion unless
we needed to do video capture of a *digital* video signal.  If we needed
to do video capture of an analog video signal, I would do analog
conversion to RGB and then digitize that since otherwise you are going
to loose information.

We're not doing any kind of capture at all.  I'm talking about
accelerating the last step of video _playback_, which is YUV to RGB
conversion.

OTOH, can the same hardware with different coefficients do the reverse
conversion?

From the formulas we have, it appears not.  If we were to generalize
it a lot, yes.  We just need a 4x3 matrix.  But we want to simplify it
and build the constants into the logic.
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