Crashing directly.
Scene worked a little while ago.

What can this mean?

Rendering of /home/blaha/blaha.mp4 crashed

[filter avcolor_space] Invalid format none
[swscaler @ 0x7f35811c6a00] Warning: data is not aligned! This can lead to a speed loss

After some investigation I found that I had enabled GPU processing sometime after the last working render about a week ago and forgot about it.
Turned it off and it renders again.