Bug 515840

Summary: RGB parade is blank after restart
Product: [Applications] kdenlive Reporter: Bernhard R. Fischer <bf>
Component: User Interface & MiscellaneousAssignee: Jean-Baptiste Mardelle <jb>
Status: NEEDSINFO WAITINGFORINFO    
Severity: minor CC: berndmj
Priority: NOR Keywords: triaged
Version First Reported In: 25.12.2   
Target Milestone: ---   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Bernhard R. Fischer 2026-02-10 22:32:24 UTC 
SUMMARY
The RGB parade scope is completely empty if Kdenlive is restarted.

STEPS TO REPRODUCE
1.  In an active project (with clips in the timeline) enable the RGB parade scope: View -> Scopes -> RGB Parade.
2. Verify that it shows something (move back and forth in your timeline and observe that the scope works).
3. Exit Kdenlive.
4. Start Kdenlive and choose a project to load.
5. After Kdenlive finished loading the project go to the RGB Parade widget. (It should still be enabled.)

OBSERVED RESULT
The window is just empty showing nothing.
To fix it, disable it in the menu (View -> Scopes -> RGB Parade) and enable it again. It will then just work fine again.

EXPECTED RESULT
The RGB diagram shall be shown.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-14-generic (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
It is tested with the latest app image and with my self-compiled version. Both behave in the same way.
Comment 1 Bernd 2026-02-11 19:04:28 UTC 
Does that happen with X11, too?