Bug 460688

Summary: Crash: when going back in history/undo ctrl+z (after Time Remapping)
Product: [Applications] kdenlive Reporter: Veps <veps>
Component: Video Effects & TransitionsAssignee: Jean-Baptiste Mardelle <jb>
Status: NEEDSINFO WAITINGFORINFO    
Severity: normal CC: fritzibaby, luzpaz
Priority: NOR    
Version First Reported In: git-master   
Target Milestone: ---   
Platform: Other   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Veps 2022-10-19 00:09:13 UTC 
==== SUMMARY
Crashes when trying to revert changes after "Time Remapping" alias Speed Ramp.

==== STEPS TO REPRODUCE
[0. Load existing profile.]
1. Apply speed ramp to clip
2. Make some time changes
3. De-select clip and undo changes via CTRL+Z

==== OBSERVED RESULT
Problem signature:
  Problem Event Name:	APPCRASH
  Application Name:	kdenlive.exe
  Application Version:	0.0.0.0
  Application Timestamp:	00000000
  Fault Module Name:	libmlt++-7.dll
  Fault Module Version:	0.0.0.0
  Fault Module Timestamp:	00000000
  Exception Code:	c0000005
  Exception Offset:	000000000000939b
  OS Version:	6.1.7601.2.1.0.256.48
  Locale ID:	1031
  Additional Information 1:	d99f
  Additional Information 2:	d99fe4f86dd04d2d5b3aec01d3dc19f1
  Additional Information 3:	ea16
  Additional Information 4:	ea16c338e91f971974e5362c820ef98e

==== EXPECTERED RESULT
When the very first recorded history/state of the project is reached do nothing even if I though I continue to press CTRL+Z.

==== SOFTWARE/OS VERSIONS
Windows: 7

==== ADDITIONAL INFORMATION
Have the impression that kdenlive tried to go "before" the very first state like "state -1" since I think I already saw the very first state reemerging in the timeline right before the crash while hitting multiple times CTRL+Z.
Comment 1 emohr 2023-12-30 09:16:10 UTC 
Thank you for reporting. I can confirm the crash following your steps (tested with 23.08.4).
Comment 2 emohr 2025-08-12 15:52:47 UTC 
I checked with the latest master (commit 2640a1d21b).
The crash is gone when doing undo with ctrl+z.

But if I select an undo step and click on the clip the time-remap effect doesn’t appear in the effect stack anymore.
Comment 3 luzpaz 2026-01-22 22:50:53 UTC 
(In reply to emohr from comment #2)
> I checked with the latest master (commit 2640a1d21b).
> The crash is gone when doing undo with ctrl+z.
> 
> But if I select an undo step and click on the clip the time-remap effect
> doesn’t appear in the effect stack anymore.

Should this ticket be closed an new one opened ?
Comment 4 Bug Janitor Service 2026-02-06 03:50:26 UTC 
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!