Get MP3 Length in Linux / FreeBSD

salon_sue

I have a bunch of mp3 files with various length. I want to cut it down to 50%-60% length. Says, from 1 minute down to 30 seconds. It should be trivial using ffmpeg. But, I don't know how to determine the original length of it as a base for processing using ffmpeg. Anyone have an idea?

Originally asked by ariefbayu on Stack Exchange (superuser) (CC BY-SA 2.5).

uphilltech

Great question — answering as the UphillTech team:

With ffmpeg there's no way I know to get the length as a variable you can use on a script. But mp3info does. mp3info -p "%S" sample.mp3 // total time in seconds

Full answer by A Dwarf: https://superuser.stackexchange.com/a/63430 (CC BY-SA 2.5).

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