Totally support 10 bit output?

[hooke007]

My monitor: Queried output: \\.\DISPLAY4, 3840x2160 @ 10 bits
When I test the different --gpu-api, I found the differences in the log.

1. --dither-depth=auto will select 8 bit for Vulkan&Opengl, while 10 bit for D3d11.
2. swapchain format: R10G10B10A2 will be chosen when use Opengl&D3d11, no such message for Vulkan.
3. Opengl: Reported display depth: 8 ; D3d11: Reported display depth: 10 ; no such message for Vulkan.

So does it mean only the d3d11 support 10 bit output correctly?

Log file

d3d11.log
opengl.log
vulkan.log

[zc62]

So does it mean only the d3d11 support 10 bit output correctly?

In windows, yes. And the suggestion would be, stick to d3d11 if you use windows. Probably see #5237

OpenGL and Vulkan do support 10 bit in principle, but not in mpv+windows. I'm not sure about OpenGL, but for vulkan, I think I heard from haasn that it depends on the implementation provided by your video card vendor. If their implementation does not support 10 bit, there is no way for mpv to utilize 10 bit through vulkan API. You can check by running vulkaninfo

[hooke007]

vulkaninfo.txt
Thanks for your suggestions.
So stupid was I. The format for Vulkan should be A2B10G10R10, now I can clearly see that
[ 0.957][d][vo/gpu/vulkan/libplacebo] Picked surface format VK_FORMAT_A2B10G10R10_UNORM_PACK32, space VK_COLOR_SPACE_SRGB_NONLINEAR_KHR
But at this time, mpv still chose to dither to 8 bit for Vulkan. It's weird.

[Akemi]

i don't think it is weird, since it's not implemented for vulkan i believe. at least auto picking it https://github.com/mpv-player/mpv/blob/master/video/out/vulkan/context.c#L223-L226

for comparison:
opengl https://github.com/mpv-player/mpv/blob/master/video/out/opengl/context.c#L212-L237
d3d11 https://github.com/mpv-player/mpv/blob/master/video/out/d3d11/context.c#L187-L195

[hooke007]

It seems windows users who care about the correct output have no other choices except D3d11.

[haasn]

You can use --dither-depth=10 to override the auto-detection.

[hooke007]

You can use --dither-depth=10 to override the auto-detection.

I know it is useful.
I just wonder if it will have other potential possibility that Vulkan actually output 8 bit.