I tried to add the Arnndn filter to my audio track, but it says
Arnndn
[filter avfilter.arnndn filter6] Cannot init filter
Version 25.12.0 - flatpak.

I tried to add the Arnndn filter to my audio track, but it says
Arnndn
[filter avfilter.arnndn filter6] Cannot init filter
Version 25.12.0 - flatpak.

The same applies to AppImage.
From what I can tell, the filter requires a model to be loaded for which there is no parameter in the UI. It is a required value and therefore the filter fails.
It’s best to avoid that one until we have figured out what to do and where models can be loaded from .