BMPCC4k jitter issues

Am currently doing test with BMPCC4k for up coming project and we are having jitter issues with the camera. When static on a tripod, with no panning or tilting, any movement by talent laterally or even away from or to the camera looks jittery and not the compfey motion blurr expected... Camera version is 7.3 Settings are Braw constant quality 3:1, 180 degree shutter, 24 frames /sec...I have reviewed other BMPcc4k footage online and it doesnt look anywhere near as bad as what we are experiencing..Is there a camera fault or are the settings in need of adjustment...Any advice would be much appreciated...Jon

Upload a small clip to judge, original braw or prores not export of it.


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Hey Thanks for the suggestion, am currently building the pc for editing so unable to do that at the moment. I was wondering if it is a monitoring issue as my 24 inch field monitor is 1920x1080p, the camera monitor is also 1920x1080p therefore not truly representative of the raw files. I wonder if anyone else is noticing jitter on the camera monitor...

The issue may be that your selection of 24 fps for recording is not a perfect ratio for your monitor that may be 60 fps. This has been identified in other threads. If the monitor was refreshed at 120 fps then you wouldn’t see a jitter in the motion on your footage. If the video recording was captured at 30 fps or 60 fps, no jitter.

It might be possible that when you posted your clip online, it was converted to 29.97 fps.

Robert Niessner wrote:

"The next thing is you cannot expect a clip shot in 24fps or 25fps playing back smoothly on a computer monitor which normally uses 60 Hz."

Re: Pocket Cinema Camera 6K "Issue"

viewtopic.php?f=2&t=132314&p=718265&hilit=+http%3A%2F%2Fdigifonics.com%2F24+fps.html+#p718265

Am currently doing test with BMPCC4k for up coming project and we are having jitter issues with the camera. When static on a tripod, with no panning or tilting, any movement by talent laterally or even away from or to the camera looks jittery and not the compfey motion blurr expected... Camera version is 7.3 Settings are Braw constant quality 3:1, 180 degree shutter, 24 frames /sec...I have reviewed other BMPcc4k footage online and it doesnt look anywhere near as bad as what we are experiencing..Is there a camera fault or are the settings in need of adjustment...Any advice would be much appreciated...Jon

Not to be condescending, but have you ever actually shot with true 24P? If you're looking online then most of that content is compressed and scaled to 60fps. 24fps film in theaters was typically played back at 48FPS or 78FPS where the frames would be doubled or tripled to mitigate the strobing from 24fps. There is no equivalent of shutter on modern playback devices, the refresh between frames is microseconds, so 120FPS won't present itself much differently than true 24P. If we're really talking about jitter then one can't realistically compare Youtube footage to camera native.

Good Luck

Edit: We're really talking about judder, jitter is a term used to describe deviations in a digital signal. It's being used incorrectly (myself included) in this thread.

And then, the edges of motion blur on digital cameras are more defined than on mechanical ones.
So, even if the amount of motion blur is the same, the visual impression is not the same. Unfortunately, Red bought the rights to the best solution for the problem:
https://www.red.com/red-101/cinema-temporal-aliasing

I used to shoot 30 fps with mostly 180 degree shutter angle. Then I switched to 24 fps but that may be problematic on 60 Hz displays. To avoid judder and to help smooth the image motion appearance with 30 fps, I decided to use shutter angle 270 degrees (rather than the technically ‘correct’ 216 degrees) with 30 fps for my shoot earlier this month. So I have added some motion blur to take the video edge off and the results seem fine to my eye. I think I’ll stay with that solution where feasible.

If I do go back to 24 fps, it might not hurt to standardize on 216 degree shutter angles for that frame rate to simulate the blur with a rotating mechanical shutter.

Thanks all for your contributions...Currently shooting in Romania where power is 50htz, monitor displaying 50 htz on input, camera set to 50htz..Nearly all my previous work was for TV shot in 50i where there was marginal jitter. Yes 24p, for a this big project, is new for me only having shot various interviews in that format before. This current project is intended for film festival where I have been recommended to shoot in 24p...so not initially intended for online delivery...thanks to all Jon

Well, 50i has twice the temporal resolution and then, 24 doesn’t display smoothly on most computer displays. Stick to 180 degrees shutter and to the established rules for panning and you should be fine.

Can’t really have this discussion until we look at the same shot you’re looking at.

You need to post an example or two. Preferably a camera original file.

JB