It's A Digital Disease!

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The original was posted on /r/datahoarder by /u/finstino on 2024-01-23 06:29:15+00:00.

Can anyone explain why an mp3 file is 380 MB while m4b is 1.29 GB? I have done this in the past and there seems to be a pretty big variance in size from mp3 to m4b sometimes by just a few MB or like in this situation almost a full GB, I want to make sure I'm not doing something wrong and wasting space on my SSD. I'm using ffmpeg to convert mp3 to m4b to listen to audiobooks on my iPod.

this is what I'm writing into my terminal if anyone has any advice:

Run: ffmpeg -i output.mp3 -c:a aac -b:a 128k -vn -ac 2 -y final.m4b

just for context I first converted multiple mp3s into one using:

sox *.mp3 output.mp3