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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