https://bugs.kde.org/show_bug.cgi?id=497571
Bug ID: 497571
Summary: Window recording gives incorrect resolution with
display scaling, in both spectacle and obs-studio
Classification: Plasma
Product: kwin
Version: 6.2.4
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: screencasting
Assignee: kwin-bugs-n...@kde.org
Reporter: oxal...@pm.me
Target Milestone: ---
SUMMARY
Window recording produces a video with resolution of actual resolution divided
by scaling factor (logical geometry?), rather than actual resolution, resulting
a blurry and small content. While full screen recording produces correct actual
physical resolution.
It is also reproducible in obs-studio
(https://github.com/obsproject/obs-studio) via "Screen Capture (Pipewire)":
with the same full screen game, capturing the full screen gives a 2560x1440
clear source, while capturing the game window itself gives a 2048x1152 blurry
source. (My display is 2560x1440 with 125% scale)
STEPS TO REPRODUCE
1. Have a 2560x1440 display, and set scale to 125%
2. Open "dolphin" and maximize it to occupy (almost) the full screen.
3. Open "spectacle", click "Recording" - "Window" - select the dolphin window.
Wait for one second and stop recording.
4. Repeat 3 but record with "Full Screen".
OBSERVED RESULT
The video from step 3 (window recording) is 2048x1104 for me, which is
approximately (2560/1.25)x(1440/1.25), minus the plasma panel on the top. The
text in video is also blurry and hard to read.
The video from step 4 (full screen recording) is exactly 2560x1440, the text
inside is clear and easy to read.
EXPECTED RESULT
The resolution of video from step 3 should be 2560x(1440 - top panel height) on
maximized dolphin window. And the text should be as clear as in full screen
recorded video.
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.05
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.0
Kernel Version: 6.6.63 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5700G with Radeon Graphics
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa Intel® Arc
ADDITIONAL INFORMATION
Also reproduced in obs-studio 30.2.3
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