[FFmpeg-user] Frequency response of an ffmpeg equalizer filter

[Paul B Mahol]

On 6/26/20, Nicolas VAMBAIRGUE <nicolas2020 at nv76.info> wrote:
> Hello,
>
>
> I'm starting to use the ffmpeg filters, using the documentation. It
> seems working but, I don't find the way to get the frequency response of
> a filter. For example, let's say I'm applying this filter :
>
> equalizer=f=7000:t=q:w=2:g=2,equalizer=f=1000:t=q:w=1:g=3,equalizer=f=80:t=q:w=2:g=-30
>
> in the following command :
>
> ffmpeg -re -i /home/dr_click/live.wav -acodec pcm_s16be -ar 44100 -ac 2
> -f rtp -af
> "equalizer=f=7000:t=q:w=2:g=2,equalizer=f=1000:t=q:w=1:g=3,equalizer=f=80:t=q:w=2:g=-30"
> rtp://127.0.0.1:1234
>
> It works, I'm hearing a distorted sound. And what I'd like to know, with
> such a filter, is the db gain for the 2000 Hz signal or for the 150Hz
> signal or any other frequency with a query like : give me your frequency
> and I'll tell you which gain is applied at this frequency with the
> defined filter.

Yes, with anequalizer filter.

>
>
> Thank you for your help,
>
>
> Nicolas
>
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