Topic: Reducing Flicker in Post

Hey everyone!
I live in a cheap apartment with a very outdated power grid. Because of this, when any of the other tenants' power usage change, the lights occasionally (every 90 seconds) dim, which has predictably undesirable results for brickfilming. I have employed all the usual flicker-reduction practices (diffuse lights, manual settings, etc) but due to the aforementioned problem, I get unavoidable flicker in my animations consistently. If I increase my exposure time I can definitely lessen the effect, but this makes animating take forever.

I would like to know if anyone knows of any easy ways to reduce flicker in post, ideally with Final Cut.

http://www.brickshelf.com/gallery/minifig77/stills/aousbanner.png

Re: Reducing Flicker in Post

Well a quick search on Google or YouTube got me several results, like a plugin demo clip.  Try "deflicker" or "reduce flicker" in your searches.

Beyond that, how about an Uninterrupted Power Supply (UPS) like a battery-powered surge protector?  Haven't tried it myself, but my thinking is that any voltage fluctuation would be mitigated if your lights are connected to the UPS.

https://i.imgur.com/4b9NnS3.pnghttps://i.imgur.com/GUIl0qk.pnghttps://i.imgur.com/ox64uld.pnghttps://i.imgur.com/v3iyhE5.png

Re: Reducing Flicker in Post

If one frame turned out very much too high or low brightness compared to most other frames, I'll adjust it in a photoshop-type program.

Is part of the problem I'm having shooting at a 125 shutter speed under an alternating current?

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"None practice tolerance less frequently than those who most loudly preach it."

Re: Reducing Flicker in Post

In the United States, our AC oscillates at 60Hz. So if you are shooting 1/125-second frames, you will probably see some flicker because of this. If your bulbs are incandescent this isn't so much of a problem, because the residual temperature of the filament keeps the output relatively stable. However if you are using fluorescent bulbs I would expect to see some significant flicker.

http://www.brickshelf.com/gallery/minifig77/stills/aousbanner.png

Re: Reducing Flicker in Post

I think Lechnology is on the right track, although finding plugins for fcp7 may be becoming more difficult.
I'd look for a de-flicker plugin advertised for time-lapses (as apposed to Florescent bulbs) as that kind of flicker is closer to what you get in stop motion.  I don't have any personal experience, but I've heard that there are several plugins out there that work well for that.

In the future, (though this may sound counter intuitive), a cheap thing to try would be higher end consumer LED bulbs as the drivers may be enough to smooth out the power fluctuations.
The only sure fire fix though, is to use battery powered video lights, which can be quite expensive, but should eliminate the problem entirely.

edit; for myself I just use FCPX's built in color correction with the RGB vector-scope to match the frames, unless it's really bad, in which case, re-shoot.

Last edited by MarkNelsonMovies (October 16, 2016 (04:53pm))

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Re: Reducing Flicker in Post

I'm aware fo the 60hz ocillation.  I only shot one scene in HOO under fluorescent bulbs.  It's I think about 8 minutes into episode 1.  You can see the difference in the lighting   I never used it again after seeing the result.

To be fair, I phtographed that section at work!!!!

Same with my first Lego animation: Lego Pan Am

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"None practice tolerance less frequently than those who most loudly preach it."