Mailing List AE-List@media-motion.tv ? Message #42121
From: Steve Oakley <steveo@practicali.com>
Subject: Re: [AE] fluorescent flicker in video
Date: Tue, 14 Feb 2012 10:00:25 -0600
To: After Effects Mail List <AE-List@media-motion.tv>
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24P on nearly all video cams is actually 23.976 ( some cameras can be set to 24.000 which is flicker safe ) and it very much can flicker or produce roll bars.  line frequency is 60.000hz and only 24.000 and 30.000 are actually "flicker free" safe for 180deg shutter speed. that fraction off does matter -  I have seen one example where the color shifts over several minutes as the lights change phase with the camera under flo lighting.

if you scan thru the footage at 5 or 10X it can be pretty easy to spot dark roll bars in the footage. this freaks most people out. in reality, played at normal speed, its generally not noticeable UNLESS you know its there, you're looking for it, and you have a pretty bad case of it. most of the time, the average view will never see it or notice it.... or care :(

steve o

On Feb 14, 2012, at 9:09 AM, John Morgan wrote:

Can you describe the video’s settings? I shoot in fluorescent all the time @ 720p24 180° shutter and don’t see any flickering.
John
 
From: After Effects Mail List [mailto:AE-List@media-motion.tv] On Behalf Of Greg Bacon
Sent: Tuesday, February 14, 2012 7:56 AM
To: After Effects Mail List
Subject: [AE] fluorescent flicker in video
 
Hi All,
 
I just received some video footage of a 'clean' room where the camera person forgot to compensate for the fluorescent lights.  The video has this flicker in it… do any of you know how to compensate after the fact to reduce it?
 
Greg

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