Bug 474960 - kdenlive crashes using Rotoscope
Summary: kdenlive crashes using Rotoscope
Status: RESOLVED FIXED
Alias: None
Product: kdenlive
Classification: Applications
Component: Video Effects & Transitions (other bugs)
Version First Reported In: 23.08.1
Platform: Microsoft Windows Microsoft Windows
: NOR crash
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-09-28 00:59 UTC by Richard
Modified: 2023-10-05 07:27 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed/Implemented In: 23.08.2
Sentry Crash Report:


Attachments
kdenlivecrashproject (65.66 KB, application/xml)
2023-10-02 23:32 UTC, Richard
Details

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Description Richard 2023-09-28 00:59:33 UTC
SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1.  Load supplied project
2.  Press Play
3.  Watch it crash shortly after

OBSERVED RESULT
Kdenlive crashes. It was crashing in my main project so I extracted the suspect elements to a new project and, bingo! it crashes too.

EXPECTED RESULT
Crash

SOFTWARE/OS VERSIONS
Windows: 

Qt Version: 
Windows 10

ADDITIONAL INFORMATION
Comment 1 emohr 2023-10-01 10:12:12 UTC
The project file is missing. Please use “add an attachment”.
Comment 2 Richard 2023-10-02 23:32:45 UTC
Created attachment 162040 [details]
kdenlivecrashproject

sorry, project attached, had to change to color clips cos videos were too large
Comment 3 Richard 2023-10-02 23:34:33 UTC
I've attached the file, cheers
Comment 4 emohr 2023-10-03 15:13:01 UTC
Thank you for the project file. I can confirm the crash. 
With GDB running no crash happen. It seems to be a race condition.
Comment 5 Jean-Baptiste Mardelle 2023-10-05 07:27:11 UTC
Thanks for your detailled report, this was an interesting bug. MLT's keyframes are currently quite limited and the smooth interpolation uses a Catmull interpolation which sometimes produces some unexpected curve path. Some work is being done on it:
https://github.com/mltframework/mlt/pull/957

So in fact the Transform effect keyframes were requesting a 0x0 rectangle, which crashed the Rotoscoping effect. I now fixed these issues in MLT git and it will be included in our 23.08.2 binaries.