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I did some addtionnal tests with various LAV settings (all tests with 4K HDR films on 4K TV):

 - DXVA Write back : smooth, works well, good image quality

 - D3D11 : smooth, good image quality, sound problem, some crash with DVD's

 - Nvidia CUVID : smooth, works well, image quality not as good as other settings

I choosed on the  DXVA Write back setting.

I try to change MadVR settiings, but for the moment i did not see any différences (performance/quality).