I have been using FFMPEG to Normalize my music library using -af loudnorm=I=-16:TP=-1.5:LRA=11:measured_I=-27.2:measured_TP=-14.4:measured_LRA=0.1:measured_thresh=-37.7:offset=-0.7:linear=true

I feel as though there are still audio files which are noticably quieter than others. I hade hoped that using a small measured_LRA would combat this as there shouldnt be much difference between the quieter and louder parts but it doesnt seem to have worked like that!

Is there a recommended way to test my audio to check that all tracks are within the same normalized range?

When I check the replayGain values of all my audio, there are quite large differences between most. I have used OceanAudio to check the wave etc

But in all honest, Im not 100% sure what to check to confirm that the files are all normalised to the same range. And, if they are, how to then adapt my Normalization script

Any help would be much appreciated

I checked with Foobar. this is the before pic
Before Pic

The after Normalization pic
After Pic

The values have changed, however, in the after pic, all the values are different and quite varied

LUFS Integrated varies per file from -5.03dB to -23.11dB

True Peak varies per file from 0.01dB to -10.19dB

I gave audacity a try to normalize the music... I feel as though it has done a better job, all files have an LKFS of either 12.8 or 12.9

But, some files still seem quieter than the others.

I have takes a screenshot from Orban Loudness meter of 2 audio files which sound notabley different.

Can someone help explain what might be going on?

Louder audio file Quieter Audio File

  • If you've used loudnorm, you should disable replaygain [which is still presumably based on the pre-normalising figures]
    – Tetsujin
    Oct 3, 2023 at 6:55
  • 1
    @tetsujin after using loudnorm, I put the files through mp3gain and then used foobar to update the replaygain. I would assume that replaygain only comes I to effect if u use a player with the replay gain option?.. my question though, is... how can I tell if the loudnorm has actually done what I want it to do? Is ther3 a way to tell visually? Because when listening to the tracks, I can tell that it's done something but they still all appear to be at different levels
    – PaulMcF87
    Oct 3, 2023 at 17:14
  • @Tetsujin I have added some foobar pics but Im still not sure what I should be looking for Oct 3, 2023 at 17:56
  • I don't really know how ffmpeg calculates this, sorry - but as the after figures frequently hit over-peak & the LUFS values vary wildly, something, somewhere is not doing a very good job. I use Myriad for this kind of task, but it's Mac only & not cheap.
    – Tetsujin
    Oct 3, 2023 at 18:16
  • @Tetsujin I only have a windows computer. And Im only normalizing my own files, I dont do it professionally. I only really want them normalised so that I dont need to keep changing the volume when listening to music in my car. I was hoping FFMPEG would be the answer but Im struggling Oct 3, 2023 at 18:40

1 Answer 1


Make sure to use 'Scan per file track gain' in Foobar2k if you've selected multiple albums, as album gain keeps the inter-track dynamics. Afaik MP3Gain >= ReplayGain.

Consider Replaygain Override in Foobar2000 to use track gain in shuffle play.

Audacity is a good FLOSS (Free Libre Open Source Software) audio editor with waveform and dB display.

  • I had tried Audacity, was a bit of a pain because when you try and bulk normalize, it doesnt maintain any metadata other than the title. after a few days, I managed to get through all of my audio files. But I feel as though I have the same problem as I did with FFMPEG. I added a couple of pics on to the initial question to show the difference between 2 audio files Oct 8, 2023 at 20:43

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