I have a 1 min matinee made with a few camera cuts of a fairly small environment scene of low complexity, I previously rendered it out with the movie button without problems at scalability setting Epic.
Then I worked on the scene some more adding more props and materials and textures and also improved the lighting from all static to some stationary.
I then re timed the matinee with some stretching and such.
Now what happens is consistent and a clue but I can’t decifer; when I render out the movie it still looks great, but then after 3 or 4 seconds it jitters and is aliased, then it cuts to the next camera move, looks great but again after 2 or 3 seconds it starts to jitter again and so on until it finally jitters aliased constantly.
Is it something to do with my computer now not able to handle the scene, except it looks great before the jitter.
Could it be something to do with tone mapping?
It could be to do with temporal AA I know, Scalability Reference | Unreal Engine Documentation
It says “r.PostProcessAAQuality4 will settle slower but will not jitter”, but that makes no difference to the problem.
What is the cause?
And importantly how can I fix it?