Bug 500247 - Problems opening transparent PNG file in latest git, and "qtblend" error
Summary: Problems opening transparent PNG file in latest git, and "qtblend" error
Status: RESOLVED FIXED
Alias: None
Product: kdenlive
Classification: Applications
Component: Video Effects & Transitions (show other bugs)
Version: git-master
Platform: Microsoft Windows Microsoft Windows
: NOR normal
Target Milestone: ---
Assignee: Jean-Baptiste Mardelle
URL:
Keywords: triaged
Depends on:
Blocks:
 
Reported: 2025-02-17 11:03 UTC by Bibido
Modified: 2025-03-12 11:34 UTC (History)
1 user (show)

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


Attachments
blank PNG (22.46 KB, image/png)
2025-02-17 11:03 UTC, Bibido
Details
Problem when opening existing project (10.67 KB, image/png)
2025-02-17 11:05 UTC, Bibido
Details
A blank PNG appears white in the Project Monitor (13.68 KB, image/png)
2025-02-17 11:06 UTC, Bibido
Details
MLT modules missing in git portable version (27.34 KB, image/png)
2025-02-22 12:54 UTC, Bibido
Details

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Description Bibido 2025-02-17 11:03:20 UTC
Created attachment 178475 [details]
blank PNG

SUMMARY
Today's git build (9670) of Kdenlive seems to have problems with transparent PNG files and certain transitions/effect I have loaded in my project appear to be missing, like "qtblend transition" or "audiospectrum effect" just to name a few.

STEPS TO REPRODUCE
1. Open a new project and insert the "blankpng" I have attached here (produced with Krita)
2. 
3. 

OBSERVED RESULT
When you open the "blankpng" image, an empty Transcode Clip window will pop up but you can't take any action because there is nothing to select.

EXPECTED RESULT
Transparent PNGs should work as before this build, as well as previous effects or qtblend.

SOFTWARE/OS VERSIONS
Windows: 11 Pro
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 Bibido 2025-02-17 11:05:06 UTC
Created attachment 178476 [details]
Problem when opening existing project
Comment 2 Bibido 2025-02-17 11:06:29 UTC
Created attachment 178477 [details]
A blank PNG appears white in the Project Monitor
Comment 3 Jean-Baptiste Mardelle 2025-02-17 15:42:20 UTC
Works for me with the latest build (9678). Can you please check ?
Comment 4 Bibido 2025-02-17 16:41:13 UTC
(In reply to Jean-Baptiste Mardelle from comment #3)
> Works for me with the latest build (9678). Can you please check ?

With "build 9679" I still get the same issue: the transparent PNG turns white and suggests me to "Transcode Clip" when I insert the image from my file browser.

No such issue with the portable "stable build" 24.12.2.
Comment 5 Jean-Baptiste Mardelle 2025-02-18 08:55:35 UTC
Oh ok, I can confirm the issue, but only for the portable version.
Comment 6 Bibido 2025-02-22 12:53:32 UTC
You are right, the installer version works as expected. 

I use the portable versions for testing the latest. It tells me there are missing MLT modules: qimage, pixbuf and kdenlivetitle (screenshot attached).
Comment 7 Bibido 2025-02-22 12:54:23 UTC
Created attachment 178731 [details]
MLT modules missing in git portable version
Comment 8 Bibido 2025-03-12 11:34:32 UTC
In today's git build 9816, the issue I reported with PNGs has been fixed.

Thank you!