Flickering/flashing after export image slideshow

Help
1

Hi,
i’ve created a image slideshow ( 10 images, every image 4s with a transform for keen burns effect). I then used the “mix clips” function to get a transition between the images.
In the exported video there are errors: during the transition between the current and the next image the current image flashes randomly in full opacity until the transition is finished.
If i disable the checkbox “use transparency” (0 in the project file) in every transition, the export is without errors ant the transitions are smooth as they should be.

Do i something wrong or is this a bug?
I can upload small files with and without error, if someone want to look at it.

thanks
Tobias

2

Which OS and version of Kdenlive? Appimage/standalone or installed (how)? What is the default blending mode (in Settings)?

3

Hi,

sorry, here are the Infos:
Laptop with Debian 12
Kdenlive appimage (kdenlive-24.05.1-x86_64.AppImage) from Homepage
Default blend mode: Sorry, i cannot find the default setting. At the transitions there is Setting “Luma” and Wipe-Method: None(Disolve)

Thanks
Tobias

4

Sorry for my writing from memory, but this should have been default composition mode, which can be found in Kdenlive Settings > Misc about halfway down the screen

5

Have you got “parallel processing” (the checkbox in the render dialog) enabled when rendering?

Overlapping transparency does seem to be one of the things that still has a high chance of glitches when that is enabled.