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Light sparkling in viewport & movies

Hi, everybody

As you can see in the video, it look like spots fade in/out, bur seens few weeks, i start UE, i have always this
I’m using UE5, only a directionlight and a postprocess on the scene.
Thanks for yours answers
Denis

Check your post process - Bloom- it is most likely set to “convolution” .

Thanks for your help,
but PP>Lens>Bloom all items are unchecked.
I have this twinkle also in the view port.
I try to check/uncheck items of the menu Show, no succed…
If i cut off the PostProcess on the scene, the directionnalLight steel flickering, but if i add a PointLight this one does not vary.