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Re: normalize audio in mp4s



Quoting Emanuel Berg (2020-03-11 17:15:08)
> Jonas Smedegaard wrote:
> 
> > Try check if the audio stream of that movie is AC-3, and if
> > so then try use mpv with the option --ad-lavc-ac3drc (read
> > the man page for valid values).
> 
> OK, I'll try this...
> 
> > If you experience similarly expanded dynamic range also for
> > differently encoded audio sources then more likely there's
> > a problem in how your system downmixes multi-channel audio
> > (like deloptes is getting at).
> 
> I experience this all the time, before "Ford v Ferrari" it was
> "Battle Angle Alita" which is an mp4, not mkv, file.

Maybe your system simply treats multi-channel audio wrongly.

A simpler alternative to recoding audio with fine-tuned values could be 
something like this to force use only stereo:

  mpv --audio-channels=stereo ...


 - Jonas

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 * Jonas Smedegaard - idealist & Internet-arkitekt
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