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Oh, and I have Mpv Player installed too. Haven't had enough time to test it until now, but a special feature (or a bug?) of this soft is that when launched it deactivates f.lux (which is reactivated just after Mpv is closed). So in case of f.lux usage, using Mpv makes the video itself is more natural, more sunny. But it can be a shock for your eyes when you start it after having used your pc with 2500k color temperature for hours.
MPV is based on the extremely powerful and flexible mplayer. This sort of problem can be solved by fine-tuning the video parameters. I'd start by changing the -vo (output driver). Try