Kdenlive 'Preview Monitor' Displays no Video, but Audio

Help
1

Kdenlive: Version 24.12.3

Distributor ID: Debian
Description: Debian GNU/Linux 13 (trixie)
Release: 13
Codename: trixie

NVIDIA-SMI 595.58.03
Driver Version: 595.58.03
CUDA Version: 13.2

x11

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Kdenlive will not display the video from within, no Monitor Preview video is visible.

However, everything else is loaded.

This happens with installations from Debian repository, and flatpak, and the AppImage.

Did try installing and reinstalling Nvidia drivers, installing extra codecs, and all to no avail.

I did not have this issue with Debian 12.

It is similar to this post issue:

Kdenlive preview in monitors not working

Any suggestions on how to tackle this issue?

Thank you

2

I am more than happy to supply logs for this KDE and non-displayed video within the preview panel issue; or at least, if pointed out where and which logs I should be looking at.

Thank you

3

Issue is that Kdenlive had to be ran as sudo:

$ sudo kdenlive

And I was able to get the preview to load the video.

Thus issue is resolved.

Thank you

4

What do I need to change the permission for Kdenlive?

How to run Kdenlive as the user instead of sudo?

Thank you

5

If I run Kdenlive with:

$ sudo kdenlive

Then I do get the Preview Panel video loading/showing; but no audio is loading.

However, if I run Kdenlive with current user:

$ kdenlive

I only do get audio loading within Preview Panel; and no video is loading.

Is it a “groups” issue? If so, how do I correct this?

Thank you

6

Please try the 25.12.3 AppImage or Flatpak (both available from the Kdenlive Downloads page) or wait for 26.04 to be released (ETA is this week).