Bug 470237

Summary:	Kdenlive 23.04.1 Preview-rendering is STILL broken.
Product:	[Applications] kdenlive	Reporter:	rjs205 <robjamespogi>
Component:	Timeline & Editing	Assignee:	Jean-Baptiste Mardelle <jb>
Status:	CONFIRMED ---
Severity:	normal	CC:	berndmj, fritzibaby
Priority:	NOR
Version First Reported In:	git-master
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Screenshot of my timeline A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render A shot of the failed pre-render and a shot of the one (disabled text layer) with the successful pre-render

Description rjs205 2023-05-25 04:55:38 UTC

SUMMARY
***
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***


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