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

[Julian Pilfold-Bagwell]

Thanks for getting back.  I was trying to insert a flag for noise reduction
into the command above but it always seemed to crash the moment I ran it.
Part of my question is what the correct format would be.

On Sun, 20 Feb 2022 at 11:12, Paul B Mahol <onemda at gmail.com> wrote:

> 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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