[FFmpeg-user] HOW TO APPLY LOUDNESS R128 PROFILE

[Marco Mircoli]

Thank you!


Il giorno gio 24 set 2020 alle ore 09:54 Paul B Mahol <onemda at gmail.com> ha
scritto:

> On Wed, Sep 23, 2020 at 03:30:25PM +0200, Marco Mircoli wrote:
> > Thanks Motitz,
> >    this is a one pass norm.
> > Is there a way to implement 2 pass?
>
> Yes there is a way, you can search google among other things.
>
> First run loudnorm to get report of loudness values, after that
> use that reported values in new, 2nd pass.
>
> > Thanks.
> > S.
> >
> >
> > Il giorno mer 23 set 2020 alle ore 14:42 Moritz Barsnick <
> barsnick at gmx.net>
> > ha scritto:
> >
> > > On Wed, Sep 23, 2020 at 14:16:31 +0200, Marco Mircoli wrote:
> > > > Just bought a php script that use ffmpeg.
> > >
> > > I hope it's worth it. ;)
> > >
> > > > this is the line
> > > > $shell     = shell_exec("$ffmpeg_b -i $audio_file_full_path -map
> 0:a:0
> > > -b:a
> > > > 96k $audio_output_mp3 2>&1");
> > > >
> > > > I'm wondering if it is possible to include in the conversion the
> audio
> > > > level normalization to R128 loudness profile.
> > > > I think it is possible, but I don't know how to do it :-(
> > >
> > > Sure. You just need to insert a filter to the command line. The R128
> > > filter is even described here:
> > >
> > > https://trac.ffmpeg.org/wiki/AudioVolume#LoudnessNormalization
> > >
> > > > $shell     = shell_exec("$ffmpeg_b -i $audio_file_full_path -map
> 0:a:0
> > > -b:a 96k $audio_output_mp3 2>&1");
> > >
> > > Just add the loudnorm filter:
> > >
> > > $shell     = shell_exec("$ffmpeg_b -i $audio_file_full_path -map 0:a:0
> -af
> > > loudnorm -b:a 96k $audio_output_mp3 2>&1");
> > >
> > > To fine tune the filter's behavior, check ffmpeg's filters
> > > documentation, or
> > >
> > > $ ffmpeg -h filter=loudnorm
> > >
> > > Good luck,
> > > Moritz
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