Hi again and thanks!! I have a Ryzen 3600x. I tried to reinstall all drivers but I still have the same problem, use of CPU 100% with 4k 16bits videos. In Application settings -> GPU acceleration I can see my GPU, but if I force the rendering device to "CPU only" the use of CPU is the same than when I force to AMD RADEON RX6700XT, that's why I think something it doesn't work properly. I configure the "Allow output in 10 bit color depth" to never and for the moment it works. Is enough for me, no problem, but its estrange because I never had problems with my old Nvidia 1650super...
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