Transition previews are not generated.

[Burinis]

I have this problem: I download transition packs, but their previews aren’t generated. It says “Failed to generate transition previews. Check the application logs for details.”
I download them directly in KDEnlive using AmneziaVPN (via Finland or Poland), since I’m from Russia, although I can access the KDE Store website without a VPN.
Windows 10 Home SL (RU) 22H2 64Bit.

[luzpaz]

What version of Kdenlive are you using? (please remember to always specify this when asking for help)

[GaryB]

This was a bug in the first preview of 26.04, but was fixed for release. I mentioned it in this thread:

Kdenlive 26.04.0 released - Kdenlive

For the first time in Kdenlive's history, this version includes features implemented by so many different contributors. Our developer community is growing, don't hesitate to join us building a free and open source video editing program that respects the users privacy and provides a tool to democratize communication. This is a companion discussion topic for the original entry at https://kdenlive.org/news/releases/26.04.0

Which version are you running?

[Burinis]

My version is 26.04.2

[Burinis]

I have 26.04.2. What to do?

[berndmj]

This was a bug in the first preview of 26.04, but was fixed for release. I mentioned it in this thread:

According to this the preview generation for user-installed lumas doesn’t work.

Let me check whether this is indeed the case and what can be done about it to enable it.

[Burinis]

@berndmj

Let me check whether this is indeed the case and what can be done about it to enable it.

Here’s the screen:

I also filmed a video, but I can’t insert a link to it because it says:

An error occurred: Sorry, you can’t include links in your posts.

[Burinis]

The problem still persists! What should I do?

[Eugen_Mohr]

Can you click on that red banner. I remember a pop-up appears where you see the log. Paste the content of the log here.

[Burinis]

The error message disappeared after installing the latest version of Python, 3.14. However, the downloaded transitions are still not visible in the transition list. How can I fix this?

[berndmj]

@Burinis

How can I fix this?

I don’t think you can unless you can look at the code and change it so that it reads additionally installed luma files.

As I said in a post before, it looks like the preview (re-) rendering does not extend to individual luma files. Please be patient, we are a small team. Thanks!