4
votes
Accepted
Why videos taken in the dark has color artefacts (noise)?
The noise in dim-lit environments is a result of how digital cameras work. The exposure of a picture or video depends on three essential parameters: lens aperture, shutter speed and ISO. The first two ...
- 5,452
3
votes
Why videos taken in the dark has color artefacts (noise)?
When you have a camera with a small sensor, the little photosites can't read light very well. Photosites are like little pixels that are buckets of light that build up the image. When your sensor can'...
2
votes
Accepted
How can you use ffmpeg's afftdn -sn flag to sample noise from a reference noise file?
Commands are instructions sent from an interface external to the filter, usually an external program using a ZMQ protocol. There is a filter that can execute commands which is what I'll use here.
...
- 33.6k
2
votes
How to avoid noise when filming dark red
Filming any light that is strongly a single color is likely to produce a lot of noise because it's absorbing more light. (In your case, the red brick is absorbing green and blue, leaving only the red.)...
- 2,156
2
votes
Accepted
What causes a loud tone/noise in Blackmagic ATEM talkback?
tl;dr
Make sure none of the SDI outputs of the ATEM are routed back to its inputs.
Talkback feedback loop
The ATEM uses SDI channel 15 and 16 for talkback. If you route one of your SDI outputs to the ...
- 196
2
votes
How to edit the DeNoise parameters for all cut parts of a clip?
If you need to apply the same effect to a whole clip, you can use Master Clip effects:
https://helpx.adobe.com/premiere-pro/using/master-clip-effects.html
That way, you apply it to the file, and any ...
- 8,162
2
votes
Accepted
How can I make 4K videos shot at night with a Google Pixel 6 less grainy?
There's not much you can do. Either make the entire video darker or use some form of denoising software. Unfortunately, to get the video to be as bright as you see, it requires amplifying the image ...
- 69
1
vote
Accepted
Noise filtering/cancellation via software while recording voice
As you're working in mono, this becomes easy, using that dreaded misnomer… AI
Just record your soundtrack as normal, then throw the resulting file at Adobe Enhance (free but requires sign-up). It only ...
- 616
1
vote
Accepted
Cartoon styled stroke effect?
"Roughen edges" effect applied to the stroke layer - play with the settings.
Then "Add Grain" effect as an adjustment layer, as shown below:
Also see this answer if you need to ...
- 8,162
1
vote
How do you reduce wind gust sounds from video?
Two possible ideas. When writing this answering I'm thinking in terms of the capabilities provided by Audacity but I think the same concept will work with other software.
Pick a silent part of the ...
- 111
1
vote
How can you use ffmpeg's afftdn -sn flag to sample noise from a reference noise file?
This worked beautifully, many thanks to @Gyan.
Just to add to the accepted answer, as I needed to do this for a large number of mp3 audio files with similar noise profiles and with a naming scheme of ...
1
vote
What to do in order to avoid noises on records from DSLR for greenscreen?
I presume what you call noise is caused by uneven lightning, so when your NLE removes green, you see splotches or brighter or darker green that it did not remove.
The first and foremost task is to ...
- 494
1
vote
Accepted
What to do in order to avoid noises on records from DSLR for greenscreen?
Well, the noise has little to do with the green screen, with the probable exception that you can now compare your image vs a clean background.
The only way to reduce the noise is by having more light....
- 1,202
1
vote
Accepted
Noise (from autofocus?) during Video on DSLR
The noise you talk about is usually caused by lens motors related to autofocus and motors, related to image stabilization. The best you can do is to use external microphone and connect it to ...
- 318
1
vote
Getting audio components from two audio streams to remove noise
So, you'd be inverting the phase of the noise signal, adjusting its amplification to match the level of the noise in the other clip, and then summing the two to obtain speech minus noise. You might ...
- 13.8k
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