Thanks a lot to both @appdevsw and @bombacha for the fix and the explanation!
It works perfectly now!

I'm trying to apply @appdevsw fix but I can't find the Opera folders in Ubuntu18.04

A behaviour I have noticed... whenever the stutter happens, the video (not the audio) is frozen for about 3 seconds, consistently.
But if I move the mouse, the frozen image instantly resumes motion.

What could this possibly mean?

Hi

I already had the latest ffmpeg extras, that's why videos work flawlessly both in Chrome and Firefox.

My machine runs an Intel HD Graphics 620 (Kaby Lake GT2) paired with a Nvidia GeForce 940mx (NV118).
The drivers I am using are the Nouveau ones.

Hi all

I'm running Opera 53.0.2907.68 stable on a Ubuntu 18.04 LTS (x86_64; GNOME) machine.
My problem is...
Every time a watch a video (youtube, facebook, other websites) it plays mostly OK, but at times the image (not the audio) freezes for about 1 second.
This happens many times during the same video.
Not enough to make it unwatchable, but it's definitely annoying.

What can I do to fix this?

Thanks for the help.