[FFmpeg-user] Audio Meter filter

[Paul B Mahol]

On 3/30/18, Martin Vignali <martin.vignali at gmail.com> wrote:
> Hello,
>
> I would like to show an audio meter from an audio file (something like what
> edit software display
> or like Audacity display)
>
> I try the showvolume filter, but the result is not what i would like to
> have.
>
> My command line :
> "C:\ffmpeg-20180329-af043b8-win64-static\bin\ffmpeg.exe" -i
> "D:\RefSon100Hz_Son_PCM18_03_30_18h21m17s.wav" -filter_complex
> "[0:a]showvolume=w=340:h=5:o=v:f=1.:p=1.:t=0:m=r:v=0[v]" -map "[v]" -c:v
> qtrle "D:\resAudioMeter004.mov"
>
> My input test file :
> https://we.tl/X6L69kEWAN
>
> Contains : 1000 Hz -12Db, then - 18 db, then 0 Db.
>
> If i use the peak option, i have no difference between -12 and -18 db
> And the "scale" is not what i would like to have (would like to have -12 /
> - 18 Db more close to the max level
>
> If i use the rms option, the scale is very low for all "level", and no
> differences between -12 and -18 Db.
>
> Is there another filter for that ?

Only ebur128 meter.

The peak meter, is just that peak, if you want more dynamics incrase
rate option to 60fps.
Default 25 is very low :)

I'm not happy with rms option, so if you can improve this and add
others meter that would be great.