Intermittent brightness flicker in 5D2 videos

I still see some intermittent brightness flickering (slight but noticeable) in my videos although I have disabled the following:

Auto lighting optimizer
Peripheral correction
Highlight tone priority
High ISO noise reduction
Long exposure noise reduction
AWB

I'm in manual mode. Is there anything else that I'm missing? Looking more closely at the flicker that I'm seeing, it seems to occur in the shadow areas when I pan the camera to a scene which has lower average brightness. Feels like the Automatic Lighting Optimizer is still working although it has been disabled. Maybe it is only disabled for jpeg but not movies? Thanks for the inputs

Are you using a variable aperture lens?

Yes, it's the 24-105 f4 IS on manual focus and IS on.

That lens is a constant aperture lens with it's largest opening being set at f4, but if you zoom in to a tighter framing, the f stop doesn't change like some cheaper lenses.

I would also turn off the IS and see if that doesn't help you out.

It's happening in natural lighting as well. So it's nothing to do with the lighting. My firmware is current 2.0.9. Lens used is 24-105 f4 IS and does not matter if IS is on or off. I've tried prime lenses such as 50f1.2 and 85f1.2 and the problem is still there.

Guys, I think I found the problem. It was the wmp media player. When I played the files using Quicktime, they were perfectly fine. I guess wmp does some kind of brightness adjustment.

Excellent! That's an easy fix.

mrmarks wrote in post #13223800
Guys, I think I found the problem. It was the wmp media player. When I played the files using Quicktime, they were perfectly fine. I guess wmp does some kind of brightness adjustment.

Its probably the other way around, but quicktime player is just better for playing quicktime files.

Quicktime files have gamma shift issues (midrange tones) once in a while and maybe WMP wasn't reading the files right, causing the issue. Regardless, good to hear its fixed.