As someone who downloads or buys their music to listen to via VLC, it’s quite annoying when the volume level between files aren’t consistent. Especially when I’m unable to easily to change the volume like when I’m doing physical labor as an example. So it can go from a perfectly reasonable volume, to damaging my ears, and then to where I can barely hear. I was thinking of going in and manually editing them myself to be consistent amongst each other at some point, but then it got me thinking. Is there an application that will equalize the volume on your audio files for you? If not, would anyone else have a use for one besides me? I’d love to know either way.
If you need a GUI, Audacity is a popular audio editor that has many features, one of which is normalizing levels. If you need to automate via CLI, ffmpeg is probably the tool for the job, as others have mentioned.
There’s also Tenacity, which is a fork of Audacity after it was bought by some company iirc. I was actually considering to use it to manually adjust the audio of each file. I didn’t know it had a normalize feature already though, guess it can just do the work for me then