Howto reduce 50 / 60 Hz pulsing from lights - Hardware

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

IgorBeg — Sun, 28 Apr 2024 07:59:08 +0000

@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.

RE: Howto reduce 50 / 60 Hz pulsing from lights

cincity — Sat, 27 Apr 2024 12:49:58 +0000

@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.

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

IgorBeg — Sat, 27 Apr 2024 08:30:00 +0000

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.

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

cincity — Sat, 27 Apr 2024 08:15:24 +0000

@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.

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

IgorBeg — Fri, 26 Apr 2024 19:12:03 +0000

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

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

andreapaz — Fri, 26 Apr 2024 13:33:32 +0000

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).

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

cincity — Fri, 26 Apr 2024 10:27:43 +0000

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?

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

andreapaz — Fri, 26 Apr 2024 10:25:30 +0000

One attempt might be to produce video at 50 fps instead of 25 fps (1000 --> 50 fps).

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

cincity — Fri, 26 Apr 2024 09:11:00 +0000

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.

Answer to: Howto reduce 50 / 60 Hz pulsing from lights

IgorBeg — Fri, 26 Apr 2024 09:09:00 +0000

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.