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Canon 5D: weird brightness flicker
Hi All
I shot an interview with the 5D and there is a random brightness/gamma change on about 50% of 45 minutes of the footage. Fortunately I was also shooting with a PMW350 which is clean so I’m OK but I’d like to work out what the issue is here for the future.
I’m assuming it’s not a hardware fault but can’t work out what else it could be. My settings were as follows:
1920×1080 25P
Manual exposure 50th/sec shutter f/4
ISO 160
sharpness 0
contrast -4
saturation 0Here’s a link to a short QT movie showing the problem. It’s really obvious if you scroll quickly through the clip: 1341_5dbrightnessflicker.mov.zip
Any thoughts?
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14 Replies
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Sample in link looks stable to me.
Cinematographer, Steadicam Operator, Final Cut Pro Post Production.
https://www.steadi-onfilms.com.au/ -
I could spot a brightness change on the wall in the back. I would assume it’s the changing brightness from outside the window.
But that should be on the footage of the PWM as well… So, indeed very strange… -
It’s definitely not the light changing as it’s only on the 5D footage. You can see the levels change on the whole image, although it’s much more noticeable on the BG.
I assume in manual mode there are no ‘gotchas’ where there is still some auto exposure compensation going on?
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Did you set the “highlight tone priority” and “auto lightning optimizer” to off? In some cases they produce strange artifacts – at least on my T2i and the 7D.
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Auto Lighting Optimiser was set to standard, so maybe that was it. I’ll try some tests
Thanks for the replies
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also, just to see if I could fix your footage, I made a quick auto fix after effects project. it auto fixed your white balance and flickering exposure.
ae cs3 aep
https://www.mediafire.com/?snyc3empeaea2bka gui script for enabling expressions(if you scrub, sometimes they get disabled)
https://www.redefinery.com/ae/view.php?item=rd_ExprTweakerhttps://technicolorsoftware.hostzi.com/
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Thanks Chris that ‘s really good of you 🙂 I’ve tried the AFX effect in the past that’s supposed to even out exposure without much success.
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Any chance you could re-post that auto-exposure fixing AE project? I’ve run into the same issue with exposure flickering…
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https://www.mediafire.com/?fz0s3i85a45ou58
from thread
https://forums.creativecow.net/thread/50/857931#857958if you un-hide the final output comp, and enable the top empty text layer, it will show numbers in your comp. If it says around 25 (+-5 deviation) from gamma clamp slider, the flicker will be removed automatically.
it may need a new keyframe for a new scene to scene change, but for the most part, it’s fully automatic. obviously before you render, turn the text layer off.
also, if you’re interested, I made a highlight restore program that recovers blown out spots in video >2x adobe’s RAW capability too.
https://www.mediafire.com/?o5724wvxd07mkv7
from thread
https://forums.creativecow.net/thread/2/978546#978880https://technicolorsoftware.hostzi.com/
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can you tell me how to apply your auto fix filter? – i’m very green with after effects so explain it like you would to a newbie – thanks!
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