Return-Path: Received: from mout.perfora.net ([74.208.4.195] verified) by media-motion.tv (CommuniGate Pro SMTP 4.2.10) with ESMTP id 4625815 for AE-List@media-motion.tv; Tue, 14 Feb 2012 16:54:14 +0100 Received: from mbp-17.westell.com (50-50-213-224.waus.wi.frontiernet.net [50.50.213.224]) by mrelay.perfora.net (node=mrus3) with ESMTP (Nemesis) id 0Ln8PF-1SRBu327pt-00hyyM; Tue, 14 Feb 2012 11:00:28 -0500 From: Steve Oakley Mime-Version: 1.0 (Apple Message framework v1257) Content-Type: multipart/alternative; boundary="Apple-Mail=_0EA2829F-455B-40F9-AE3B-1928786ED833" Subject: Re: [AE] fluorescent flicker in video Date: Tue, 14 Feb 2012 10:00:25 -0600 In-Reply-To: To: "After Effects Mail List" References: Message-Id: X-Mailer: Apple Mail (2.1257) X-Provags-ID: V02:K0:V0w6z1jwU4+UdvygzXeDpLgnu7AQ8SHD6Hohf6e4DL1 zpi8d4NTdLpwMuIJvSAsWE0pEeBuqYVHSdJTGd9z4PZmD44jvS 7f0YTv779FrziSaoMyixZXSuDALLf8ZmgZlTPMkojzhIXYvgqm yN+/CNA8g45Vh9W0PVjPJuYzoRBvxAbwTccuOf0zHMpOBxlPMD qF6E49u7dJ/afpBQhu7dl02KS/K+Hvgil7n8xdJXb8qL/TbfUh +CksTDX1mAEzQK1vfiiDO/eBHjgmoSBg+GlRJG2PMPinZUDRLg Kl3FEHAMHPpgXtdqSMaC20xkcQLDaIUWk6WniB2Rk1zZz+YmDU AHbYKE75BlCUV10w+SA+mgE9K3om3r3H7Ke+fTTNV1971euZVc 60vENPQWA73ng== --Apple-Mail=_0EA2829F-455B-40F9-AE3B-1928786ED833 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 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=92s settings? I shoot in fluorescent all = the time @ 720p24 180=B0 shutter and don=92t see any flickering. > John > =20 > 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 > =20 > Hi All, > =20 > 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=85 do any of you know how to compensate after the = fact to reduce it? > =20 > Greg >=20 > This message, and any attachments, is intended only for the use of the = addressee and may contain information that is privileged and = confidential or otherwise exempt from disclosure under applicable law. = If the reader of this e-mail is not the intended recipient, you are = hereby notified that any unauthorized use, dissemination, distribution = or reproduction of this message is prohibited. If you have received this = communication in error, please notify the sender by return e-mail and = delete this e-mail and any attachments from your system. =AD=AD =20 --Apple-Mail=_0EA2829F-455B-40F9-AE3B-1928786ED833 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 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=92s settings? I shoot in fluorescent all the time = @ 720p24 180=B0 shutter and don=92t see any = flickering.
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=85 do any of you know how to compensate = after the fact to reduce it?
Greg

This message, and = any attachments, is intended only for the use of the addressee and may = contain information that is privileged and confidential or otherwise = exempt from disclosure under applicable law. If the reader of this = e-mail is not the intended recipient, you are hereby notified that any = unauthorized use, dissemination, distribution or reproduction of this = message is prohibited. If you have received this communication in error, = please notify the sender by return e-mail and delete this e-mail and any = attachments from your = system. =AD=AD

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