Oppo UHD Blu-Ray player test results
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Tested with "Output Resoultion" set to "Source Direct".

1080p SDR Blu-Ray:
- 4:2:0 and 4:2:2 settings produce 4:2:2 output
- Auto and Auto-Safe settings produce 4:4:4 output
- with 4:2:2 output, output bitdepth is always 10/12 bit
- with 4:4:4 output, the bitdepth option is effective, with Auto producing 10/12 bit output
- the chroma channel is slightly blurred in X direction and shifted to the left (probably bilinear resampling)
- the chroma channel is upscaled from 4:2:0 to 4:2:2 using bilinear
- the chroma channel is upscaled from 4:2:2 to 4:4:4 using nearest neighbor
- with 4:4:4 8bit output, the luma channel is perfect, otherwise the most signifcant 8 bits are perfect, the other bits are a bit "weird"

4K HDR Blu-Ray 24fps:
- 4:2:0 and 4:2:2 settings produce 4:2:2 output
- Auto and Auto-Safe settings produce 4:4:4 output
- output bitdepth is always 10/12 bit
- the chroma channel is slightly blurred in X direction and shifted to the left (probably bilinear resampling)
- the chroma channel is upscaled from 4:2:0 to 4:2:2 using nearest neighbor
- the chroma channel is upscaled from 4:2:2 to 4:4:4 using nearest neighbor
- the luma channel is always perfect

4K HDR Blu-Ray 60fps:
- 4:2:0 and Auto-Safe settings produce 4:2:0 output
- 4:2:2, 4:4:4 and Auto settings produce 4:2:2 output
- output bitdepth is always 10/12 bit
- with 4:2:0 output, the chroma channel is blurred in X direction (probably bilinear resampling)
- with 4:2:2 output, the chroma channel is slightly blurred in X direction and shifted to the left (probably bilinear resampling)
- the chroma channel is upscaled from 4:2:0 to 4:2:2 using nearest neighbor
- the luma channel is always perfect

Recommendation for all users:
- 4:2:0 and 8 bit

Recommendation for Envy users with firmware 0.96.5.0 (or newer)
- Auto-Safe and 8 bit