Fun project!
Here's one thing I've been trying to wrap my mind around regarding HLG: I get that one of the big appeals is "backwards compatibility", and I totally see how, from an EOTF standpoint it's somewhat backwards compatible with SDR. In other words, you could feed an HLG signal to a dumb SDR display and the luminance would look mostly correct.
However, I don't understand how (without some other component) it can be backwards compatible from a color gamut standpoint. If you're doing HLG with Rec2020 or P3, from what I understand that will NOT look correct on a non wide-gamut display. Gamut conversion is not trivial.
So... how does that work?
Your screenshot looks at least mostly correct to me, so I'm wondering how you / VLC converted the gamut from Rec2020 to Rec709.
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