Comment # 3 on bug 1223210 from ell1e

I have possibly the same problem, Plasma 5 screen recording worked fine and
Plasma 6 it's broken with both Spectacle and OBS:

$ spectacle 
libva info: VA-API version 1.20.0
libva info: Trying to open /usr/lib64/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_20
libva info: va_openDriver() returns 0
kpipewire_record_logging: VAAPI: Display initialized
kpipewire_record_logging: VAAPI: API version 1 . 20
kpipewire_record_logging: VAAPI: Mesa Gallium driver 24.0.3 for AMD Radeon
Graphics (radeonsi, renoir, LLVM 18.1.2, DRM 3.57, 6.8.5-1-default) in use for
device "/dev/dri/renderD128"
kpipewire_record_logging: DRM device not found
libva info: VA-API version 1.20.0
libva info: Trying to open /usr/lib64/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_20
libva info: va_openDriver() returns 0
kpipewire_record_logging: VAAPI: Display initialized
kpipewire_record_logging: VAAPI: API version 1 . 20
kpipewire_record_logging: VAAPI: Mesa Gallium driver 24.0.3 for AMD Radeon
Graphics (radeonsi, renoir, LLVM 18.1.2, DRM 3.57, 6.8.5-1-default) in use for
device "/dev/dri/renderD128"
kpipewire_record_logging: DRM device not found
qt.qml.typeresolution.cycle: Cyclic dependency detected between
"qrc:/qt/qml/org/kde/desktop/private/TextFieldContextMenu.qml" and
"qrc:/qt/qml/org/kde/desktop/MenuItem.qml"
qt.multimedia.ffmpeg.libsymbolsresolver: Couldn't load VAAPI library
libva info: VA-API version 1.20.0
libva info: Trying to open /usr/lib64/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_20
libva info: va_openDriver() returns 0
kpipewire_record_logging: VAAPI: Display initialized
kpipewire_record_logging: VAAPI: API version 1 . 20
kpipewire_record_logging: VAAPI: Mesa Gallium driver 24.0.3 for AMD Radeon
Graphics (radeonsi, renoir, LLVM 18.1.2, DRM 3.57, 6.8.5-1-default) in use for
device "/dev/dri/renderD128"
kpipewire_record_logging: DRM device not found
libva info: VA-API version 1.20.0
libva info: Trying to open /usr/lib64/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_20
libva info: va_openDriver() returns 0
kpipewire_record_logging: VAAPI: Display initialized
kpipewire_record_logging: VAAPI: API version 1 . 20
kpipewire_record_logging: VAAPI: Mesa Gallium driver 24.0.3 for AMD Radeon
Graphics (radeonsi, renoir, LLVM 18.1.2, DRM 3.57, 6.8.5-1-default) in use for
device "/dev/dri/renderD128"
kpipewire_record_logging: DRM device not found