Re: normalize audio in mp4s

[Emanuel Berg <moasenwood@zoho.eu>]

David Christensen wrote:

> You want audio compression.
>
> Some media editors, such as Audacity, have compression (and many
> other features).
>
> Some media players, such as VLC, have real-time audio compression
> during playback.
>
> I use Xfce. I do not see a compressor in its PulseAudio
> Plugin/ mixer.
>
> There have been various audio API's/ subsystems in Linux over the
> years. JACK was designed for profession audio on Linux, and is
> very flexible. If you can get your audio streams into JACK, it
> should be possible to patch in a software compressor:
>
>     https://en.wikipedia.org/wiki/JACK_Audio_Connection_Kit
>
> Alternatively, hardware. If you are running old-school stereo
> speakers, you could buy an electronic compressor. There are many
> choices. Rolls makes good purpose-built stuff at reasonable
> prices:
>
>     https://rolls.com/product/SL33

Thank you, you seem very knowledgeable in this area...

Well, it sounds advanced... Yes, its a stereo alright, that much
I know.

I tried this but it sounds so bad I even had to put a warning in
a comment:

# first do:
# $ pip install ffmpeg-normalize
#
# but... don't use, at least not with music, sounds terrible :(
get-mp3-normalized () {
    local -a files
    files=($@)

    local dB=-10 # db/LUFS

    for f in $files; do
        ffmpeg-normalize -f -c:a libmp3lame -t $dB -ext mp3 $f
    done
} # [1]


[1] https://dataswamp.org/~incal/conf/.zsh/audio-convert

-- 
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal