I've had some success with reducing fluorescent flicker with Boris FX's BCC plugin - Flicker Fixer.
Former user
wrote on 3/1/2020, 7:35 PM
You can try the following. I copied this from either here or the internet when I had a similar problem
There is a method which will potentially work in any video editor: copy the video track to another one on the same timeline, set the opacity of both to 50%, and then slide one of them along one frame at a time. The idea is that the flickers of the two video tracks will overlap and with just the right phase shift (time delay) they cancel out. With some flicker frequencies this works and with some it doesn't because there is no offset which quite does it.
@Former user … I can see that approach working well with a static shot, but if you use that technique with a shot with, say, a person walking through the scene, wouldn't the person appear somewhat 'ghost-like' or out of focus given that the off-set video track would likely be at least a couple of frames behind the top track? Similarly, if there is any pan/tilt in the shot.
@andyrpsmith Just out of curiosity, did you film with PAL setting (25P or 50P) in an NTSC (30P or 60P) country (or vice versa) where the electricity grids depending on the country are 50Hz 60Hz?
@andyrpsmith Brazil is indeed 60Hz, this asynchroneus mismatch between camera setting and the local grid power cycles should be avoided when filming anything which involves artificial light powered by the grid in your take. But that does not solve your problem with your current film. You could try to save your film by going the artistic way, by exaggerating the flickering (like if it was intended), play with speed, cut some frames and stutter the image...
Former user
wrote on 3/2/2020, 2:45 PM
@Former user … I can see that approach working well with a static shot, but if you use that technique with a shot with, say, a person walking through the scene, wouldn't the person appear somewhat 'ghost-like' or out of focus given that the off-set video track would likely be at least a couple of frames behind the top track? Similarly, if there is any pan/tilt in the shot.
In the thread I was reading, it was suggested the problem flicker resulted from shooting at high shutter, but that is different to poster's problem who isn't doing that. They link to a video