SUMMARY: see subject STEPS TO REPRODUCE 1. start Digikam 2. start previewing any video file (I tried FullHD h.264 MP4 and h.265 MP4, generated on three different devices) 3. watch CPU load and fps OBSERVED RESULT video stutters (played from a local ext4 disk) and has a rough fps of 5..10, not more, 'digikam' uses 200% CPU. Same video file played using VLC is absolutely smooth and uses barely 5% of one core. EXPECTED RESULT Video playback should be smooth and not stuttering. SOFTWARE/OS VERSIONS: KDE Neon 22.04 with Digikam Qt6 appimage dated 20240908.
Can you share a video sample to test. Please use a cloud storage link.
@Jens, are you using Wayland? Maik
Wayland, yes.
I just noticed, the -Qt5 version does not have this problem. Only the Qt6 build.
Can you please post a log of the terminal if you play a video with the QT6 version of the Appimage? -------------------------------------------------------------------- export QT_LOGGING_RULES="digikam*=true" digikam -------------------------------------------------------------------- Maik
Git commit 9a74e01d09819894241f10816ec8af14d8b479c1 by Maik Qualmann. Committed on 15/09/2024 at 09:42. Pushed by mqualmann into branch 'master'. always assign a video backend to environment variable And make the video backend platform dependent selectable in the setup. Related: bug 487031 M +9 -5 core/app/main/main.cpp M +9 -5 core/showfoto/main/main.cpp M +12 -2 core/utilities/setup/misc/systemsettings.cpp M +6 -1 core/utilities/setup/misc/systemsettings.h M +42 -5 core/utilities/setup/misc/systemsettingswidget.cpp https://invent.kde.org/graphics/digikam/-/commit/9a74e01d09819894241f10816ec8af14d8b479c1