[FFmpeg-user] Noise in audio stream during quiet periods

[Paul B Mahol]

On Sun, Feb 20, 2022 at 12:03 PM Julian Pilfold-Bagwell <
julian.pilfoldbagwell at gmail.com> wrote:

>  Hi All,
>
>
> I'm trying to set up a tannoy system in our building using FFMPEG and
> Icecast.  The server that is streaming is being fed from the 0db recording
> output from an analogue amplifier that is wired up to an existing 100v
> system and at the receiving end are PCs with active speakers fitted.
>
> The problem that I have is that when there's no audio input to the tannoy,
> there's a background noise that is intrusive enough to play out through the
> speakers.  I've been trying to use the noise reduction features in FFMPEG
> to reduce the noise but haven't managed to get rid of it.  The command I'm
> running to run the system is:
>

What noise reductions you tried?


>
> /usr/bin/ffmpeg -f alsa -i hw:0,0 -acodec libmp3lame -ab 128k -ac 1
> -content_type audio/mpeg -f mp3 icecast://source:<password-removed>@
> 172.20.0.75:8000/tannoy
>
>
> Can anyone let me know if this is possible or if there's any way I could
> implement something akin to a radio squelch that would just mute the output
> when the input signal drops below a certain level.
>
>
> Thanks in advance,
>
>
> Jools
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