Bug 470237 - Title clip is causing the pre-render to fail (v23.04.1)
Summary: Title clip is causing the pre-render to fail (v23.04.1)
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kdenlive
Classification: Applications
Component: Timeline & Editing (other bugs)
Version First Reported In: git-master
Platform: Microsoft Windows Microsoft Windows
: NOR normal
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-05-25 04:55 UTC by rjs205
Modified: 2026-02-07 03:50 UTC (History)
3 users (show)

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

Attachments
Screenshot of my timeline (113.93 KB, image/png)
2023-05-25 04:56 UTC, rjs205 		Details
A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render (36.17 KB, image/png)
2023-07-13 16:18 UTC, rjs205 		Details
A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render (44.32 KB, image/png)
2023-07-13 16:21 UTC, rjs205 		Details
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Description rjs205 2023-05-25 04:55:38 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.  
2. 
3. 

OBSERVED RESULT
Kdenlive will try to Pre-render the stuff on the timeline but will fail after a few seconds.

EXPECTED RESULT
Pre-rendering failed. (See screenshot)

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 rjs205 2023-05-25 04:56:26 UTC 
Created attachment 159233 [details]
Screenshot of my timeline
Comment 2 rjs205 2023-07-13 16:18:14 UTC 
Created attachment 160270 [details]
A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render

So we finally pinpointed the cause. the title clip is causing the pre-render to fail. 

Further Explanation:

If we disabled the title clip, the pre-rendering goes without any problems, but if we enable it and try to pre-render, It fails. So something is wrong with the way Kdenlive handles title clip and pre-rendering.
Comment 3 rjs205 2023-07-13 16:21:27 UTC 
Created attachment 160271 [details]
A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render
Comment 4 Bernd 2023-07-13 16:29:29 UTC 
I can confirm this also for Linux 23.04.3

A simple single title clip in the timeline results in an error: Preview Rendering failed, check your parameters.

If the Show details link is available it will show this error: libpng warning: iCCP: known incorrect sRGB profile
Comment 5 luzpaz 2026-01-23 10:13:10 UTC 
Renamed ticket to be less generic. Steps to reproduce were missing so recreating the ticket was confusing.  
rj205, would you mind trying to reproduce this on latest stable 25.12.1 ?
Comment 6 Bug Janitor Service 2026-02-07 03:50:39 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.

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