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Howto reduce 50 / 60 Hz pulsing from lights

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Début du sujet

Does Cin have a plugin to reduce 50 / 60 Hz pulsation which occurs from unnatural lighting?

I created a 1000 fps Slomo and this pulsation is a problem.

Ce message a été modifié Il y a 4 semaines par cincity
9 Réponses
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Could you upload a sample file, please? If you want to https://files.fm

And write here the MediaInfo's output of the source file? Thanks.

 

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Début du sujet

Please look here -> https://klimaboy.de/posts/magnetband/

What is the "MediaInfo's output of the source file"?

 

The lighting is halogen @ 50Hz surge.

This is why I set the recorder to 25fps PAL (1000fps->25fps)

But still there occurs this pulsation in brightness which is very ugly. The resolution at this frame rate is ugly too but this is another story of course.

Ce message a été modifié Il y a 4 semaines 4 fois parcincity
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One attempt might be to produce video at 50 fps instead of 25 fps (1000 --> 50 fps).

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Début du sujet

Interesting! I wasn't aware this could make a change. Unfortunately the HFR mode of the recorder only is able to bring it down to 25 fps.

25 or 30 FPS are the only setting for HFR.

Would it make sense to change that at POST in Cin or anwhere else like ffmpeg?

Ce message a été modifié Il y a 4 semaines parcincity
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You can try making the change in CinGG: Settings --> Format... --> Frame Rate

I am curious about the result, but I don't think it will work (sampling has already been
done).

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MediaInfo is a program to know the data (format, code, frame rate,...) about a video file; or, if you want, you can use the "ffprobe" command by Command Line:

ffprobe -hide_banner -i yourFileName.mp4

Thanks for the link to the video. I saw your video and downloaded it from there. Using your video I did a test: this is the render by Cinelerra-GG. Tell me if it is good enough, please.

Test video on https://files.fm/u/m5hzk24dvj

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Début du sujet

@All

Thank you very much for your efforts.

 

@IgorBeg

Your edit can equalize the brightness very well. But the frame shift doesn*t look good. It looks not natural. I can't imagine this can be done via frame shift.

 

I just hoped there could be an existing plugin which could be something like an adjustable frequency curve on which effects can be applied to.

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I understand you, @cincity. I am sorry.

The last chance (way), I think, is to use keyframes on Brightness or Histogram_bezier plugins. You could make it for a section of the video and then paste and copy the keyframes for all the video. Only an idea.

cincity Début du sujet 27/04/2024 12:49

@igorbeg 

Yet I have used keyframes for the "given" properties e.g. fade, volume, projector and camera only.

Though it is in the documentation I haven't understood how to use them for plugins. Maybe I should try again.

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@cincity

You can use keyframes for Plugins like you use Fade, Projector & Camera. If you have a few of time, take a look at the "Title Animation 1" tutorial: https://www.youtube.com/watch?v=uVNguI5EuA0

In that tutorial you can see that keyframes for the "Crop & Position" plugin are used to create text movement. You can do the same thing for all plugins, in your case the Brightness or/and HistogramBezier plugins. But, I think, that the result will not be satisfactory for your goal.

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