Am 26.06.2020 um 19:00 schrieb Nicolas VAMBAIRGUE:
Le 26/06/2020 à 18:15, Paul B Mahol a écrit :
On 6/26/20, Nicolas VAMBAIRGUE <nicolas2...@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.
=> Ok, so let's say I'm using this command with an anequaliwer
=>_ffmpeg -re -i /home/dr_click/live.wav -af "anequalizer=c0
f=200 w=100 g=-10 t=0|c1 f=200 w=100 g=-10 t=0 curves=true" -acodec
pcm_s16be -ar 44100 -ac 2 -f rtp rtp://127.0.0.1:1234
=> How do I get the frequency graph of such a filter ? Is it
mandatory to get a video stream (and how to get / display it) ? Can't
I get command with the frequency as input and the gain as output ? Of
course, such a command would means I need to query the db output for
each interesting frequency.
Make a test file with 2kHz sine:
ffmpeg -f lavfi -i sine=2000 -t 5 -y test.wav
Analyze the volume of this file:
ffmpeg -i test.wav -af volumedetect -y out1.wav
The volume is written to the log file.
Then apply your filter and analyze the output again.
Michael
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