I have no idea how colour handling in x265 works so I can't really advise on 
specifically how to set it up. Possibly it's documented somewhere. One of the 
problems with this (which comes up in some high end post production software 
quite often) is that it's sometimes not very clear whether we're specifying 
what we expect the input data to be, or what we expect it to be converted to. 
For instance, I'm not sure what's meant by "transfer" in this context.
> It's 1920x1080. I 'heard' of "studio swing". What is it relative to what x265 
> expects (above)? Do you know? 
I'm possibly guilty of indulging in jargon here; by "studio swing" I'm 
referring to a reduced data range often from 16-235 for the luminance channel.
> I feel a headache coming on. Let's assume ffprobe is correct and colormatrix 
>is undefined on the discs
What's on the disc will be in Rec. 709. I honestly don't know what data ranges 
blu-rays use. It's often fairly clear if you can look at it and it looks all 
lifted, that'll be why. Unfortunately there are a lot of moving parts here.
P  
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