Re: [FFmpeg-user] mcompand: anybody knows how to use it?

[Paul B Mahol]

On Thu, Feb 18, 2021 at 11:33 AM Marco Mircoli  wrote:

> Hello everibody,
>tried few times to use it, never succeed :-(
>

What you tried and what you get out from ffmpeg?

> Read on internet all the document available on this filet, but nothing.
>
> Any help?
> Thanks.
> S.
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[FFmpeg-user] mcompand: anybody knows how to use it?

[Marco Mircoli]

Hello everibody,
   tried few times to use it, never succeed :-(
Read on internet all the document available on this filet, but nothing.

Any help?
Thanks.
S.
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Re: [FFmpeg-user] mcompand

[Martin Rouillard]

Thanks Paul, it is now working :-)

-af "mcompand=0.070\,0.040 6 -30/-40\,-20/-30\,-10/-20\,0/-20 85 0.2 0 0 |
0.050\,0.030 6 -30/-40\,-20/-30\,-10/-20\,0/-20 550 0.2 0 0 | 0.1\,0.2 6
-30/-40\,-20/-30\,-10/-20\,0/-20 2500 0.2 0 0 | 0.020\,0.005 6
-30/-40\,-20/-40\,-10/-25\,0/-25 8000 0.2 0 0 | 0.020\,0.005 6
-30/-40\,-20/-40\,-10/-25\,0/-25 22000 0.2 0 0"

On Sun, Mar 25, 2018 at 5:25 PM, Paul B Mahol  wrote:

> On 3/25/18, Martin Rouillard  wrote:
> > Thanks Paul, This helped but I still have an error on the attack and
> decays
> > count, here is my command :
> >
> > -af "mcompand=0.1 0.2 6 -47/-40 -34/-34 -17/-33 100 | 0.1 0.2 6 -47/-40
> > -34/-34 -17/-33 400 | 0.1 0.2 6 -47/-40 -34/-34 -15/-33 1600 | 0.1 0.2 6
> > -47/-40 -34/-34 -31/-31 -0/-30 6400 | 0.1 0.2 6 -38/-31 -28/-28 -0/-25
> > 22000"
> >
> > and the error I get is :
> >
> > [Parsed_mcompand_0 @ 0x5294d40] number of attacks rate plus decays rate
> > must be even
> > [Parsed_mcompand_0 @ 0x5294d40] Failed to configure output pad on
> > Parsed_mcompand_0
> > Error reinitializing filters!
> > Failed to inject frame into filter network: Invalid argument
> > Error while processing the decoded data for stream #0:0
> > Conversion failed!
>
> Attacks/decays are set with ',' separator between attack and decay,
> same apply for points. (input_db/output_dB , ..)
>
> You may need to escape ',' with '\'.
>
> -af "mcompand=0.1\,0.2 6 -47/-40\,-34/-34\,-17/-33 100 | 0.1\,0.2 6
> -47/-40\,-34/-34\,-17/-33 400 | 0.1\,0.2 6 -47/-40\,-34/-34\,-15/-33
> 1600 | 0.1\,0.2 6 -47/-40\,-34/-34\,-31/-31\,-0/-30 6400 | 0.1\,0.2 6
> -38/-31\,-28/-28\,-0/-25 22000"
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-- 

MARTIN ROUILLARD
Dev+Ops / 514-393-3525 / audioz.com

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Re: [FFmpeg-user] mcompand

[Paul B Mahol]

On 3/25/18, Martin Rouillard  wrote:
> Hi,
>
>  I able to use the mcompand filter but I haven't found the correct syntax
> to change to args, Is there a sample command you can share or is there a
> option to view the arguments posted by default?
>
> Thanks
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ffmpeg -h filter=mcompand

There are more user friendly multiband compressors available via lv2 filter.
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[FFmpeg-user] mcompand

[Martin Rouillard]

Hi,

 I able to use the mcompand filter but I haven't found the correct syntax
to change to args, Is there a sample command you can share or is there a
option to view the arguments posted by default?

Thanks
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