I think you're not alone with this as I experienced the very same symptoms.
I changed the debug parameter in ~/.config/xnviewmp/xnview.ini as instructed above by others, and fed the output into a logfile, which I just attached here.
At line 324 where it loads the .webm video, it gave me a clue at ...
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- Wed Dec 31, 2025 11:48 am
- Forum: MP - General Support
- Topic: Crashes on video
- Replies: 11
- Views: 2180