[FFmpeg-user] HIGHPASS FILTER AND ID£ METADATA

[Marco Mircoli]

Thanks a lot!

Il giorno gio 1 ott 2020 alle ore 14:17 Michael Koch <
astroelectronic at t-online.de> ha scritto:

> Am 01.10.2020 um 14:06 schrieb Michael Koch:
> > Am 01.10.2020 um 13:25 schrieb Marco Mircoli:
> >> Hello',
> >>      I'm a newbie.
> >> Just bought a php script that use ffmpeg.
> >> it converts to mp3/96Kbps all media uploaded in a unique format.
> >> this is the line, and now it normalizes to R128 (thanks Moritz)
> >>
> >> $shell     = shell_exec("$ffmpeg_b -i $audio_file_full_path -map
> >> 0:a:0 -af
> >> loudnorm -b:a 96k $audio_output_mp3 2>&1");
> >>
> >> I'm wondering if it is possible to include a simple hi-pass filter
> >> (highest
> >> db per octave @ 70Hz)
> >
> > add  highpass=70,    before  loudnorm
> >
> > This filter attenuated 6dB per octave. If you need higher attenuation,
> > you can use several highpass filters, for example
> > highpass=70,highpass=70,highpass=70,loudnorm
>
> Correction: The filter has 12dB per octave.
>
> Michael
>
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