Agreed, cuvid seems to be the only perfect solution today......
Does Nvidia card have good support for 23.976HZ and HD audio bitstreaming? Maybe I should throw out my HD5770......
LAV has CUVID though, which uses CUDA if you have an nVidia card. If you have an AMD or Intel card though, you're out of luck...LAV video decoder also has a high quality RGB32 converter which comes quite close to MadVR IMO.
But both solutions cannot utilize DXVA and hardware deinterlacing......