https://bugs.kde.org/show_bug.cgi?id=492202
Bug ID: 492202
Summary: 1080p videos cannot be played in mpv with vulkan if
display scale is 150% or above
Classification: Plasma
Product: kwin
Version: 6.1.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: thefeeltr...@thefeeltrain.com
Target Milestone: ---
SUMMARY
This is some extremely odd behavior that I have narrowed down to being caused
(or at least affected by) display scale. If mpv is configured to use vulkan
then 1080p videos cannot be played if display scaling is set to 150% or higher.
For some reason it only affects 1080p video and nothing else.
I have tested:
SDR and HDR content
480p, 720p, and 2160p
8-bit AVC, 8-bit VP9, 8-bit HEVC, and 10-bit HEVC
Everything plays normally regardless of the other factors except for 1080p
resolution.
Playback works at 50-125% display scale, but does not work at 150-200%.
STEPS TO REPRODUCE
1. Set display scale to 150% or higher in system settings
2. Open a 1080p video in mpv with --gpu-api=vulkan --gpu-context=waylandvk
OBSERVED RESULT
The video will be frozen. Audio continues to play, so it is purely graphical.
The mpv window also can't be resized or be made fullscreen.
Console output:
[vo/gpu-next/libplacebo] vk->CreateSwapchainKHR(...):
VK_ERROR_OUT_OF_HOST_MEMORY (../src/vulkan/swapchain.c:622)
[vo/gpu-next/libplacebo] Failed (re)creating swapchain!
[vo/gpu-next/libplacebo] vk->CreateSwapchainKHR(...):
VK_ERROR_OUT_OF_HOST_MEMORY (../src/vulkan/swapchain.c:622)
[vo/gpu-next/libplacebo] Failed (re)creating swapchain!
[vo/gpu-next/libplacebo] vk->CreateSwapchainKHR(...):
VK_ERROR_OUT_OF_HOST_MEMORY (../src/vulkan/swapchain.c:622)
[vo/gpu-next/libplacebo] Failed (re)creating swapchain!
(repeating)
EXPECTED RESULT
Video plays normally.
SOFTWARE/OS VERSIONS
OS: Arch Linux
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
CPU: AMD Ryzen 9 7950X
GPU: AMD Radeon RX 7900 XTX
Memory: 32 GB
Kernel: 6.10.6-zen1-1-zen
Driver: mesa 24.1.6
ADDITIONAL INFORMATION
My full mpv config is:
vo=gpu-next
profile=gpu-hq
hwdec=vaapi
gpu-api=vulkan
gpu-context=waylandvk
Only the gpu-api and gpu-context options seem to matter for this bug, so vaapi
and gpu-next are not the culprit.
I have a single 3840x2160 display at 120hz.
To be thorough I tried running at 60hz. No effect.
Tried running at 1440p instead of native 2160p. No effect.
Tried building mesa from the latest commit. No effect.
Tried building mpv from latest commit. No effect.
Tied both with and without ENABLE_HDR_WSI. No effect.
The only thing that works is putting display scale below 150%.
If this is not a Plasma bug feel free to close the issue, but since display
scale seems to have something to do with it I thought this is the most
appropriate place to report it. It could very well be a vulkan or libplacebo
bug that just happens to interact with display scale.
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