Background sound fluctuates in volume

G

Ging2021

New Member
I have an audio problem. It runs in sync with the video and is good quality except the background noise seems too loud until people talk then the background noise is reduced but when they stop talking it increases again. Basically the background noise fluctuates in volume.

I am running at 160 bitrate and 44.1 khz.

I have tried numerous audio filters and they either make no difference or make it worse.

Unsuccessful filters:
Gain
Invert polarity
Noise gate
Noise suppression (makes it worse)

I also use command lines
bframes=2 b-adapt=0 partitions=none scenecut=0 no-weightb weightp=0 sliced-threads

force-crf aq-mode=0 subme=0 no-deblock
 
Hi Ging,

you are victim of a thing called AGC (automatic gain control). What is your sound source you are talking about? Is it a microphone? There is often AGC involved. It makes it loud when nobody speaks, and drops only at a certain level of input volume. Thats exactly what you experienced, isn't it? With the raising gain the noise raises too. That's just it.

Instead of trying to fix that afterwards by (not therefore mentioned) audio filters within OBS you are strongly encouraged to switch that AGC behaviour off of your sound device. Fixing AGC later is a nearly impossible task.
 
konsolenritter said:
Hi Ging,

you are victim of a thing called AGC (automatic gain control). What is your sound source you are talking about? Is it a microphone? There is often AGC involved. It makes it loud when nobody speaks, and drops only at a certain level of input volume. Thats exactly what you experienced, isn't it? With the raising gain the noise raises too. That's just it.

Instead of trying to fix that afterwards by (not therefore mentioned) audio filters within OBS you are strongly encouraged to switch that AGC behaviour off of your sound device. Fixing AGC later is a nearly impossible task.
Click to expand...

Could be windows auto ducking?
 
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