"Losslessly" trim an MP3 file [duplicate]

mp3 lossless

With linux you can use mp3splt. It has a gui also if you want and is available for linux and windows.

From the man page:

mp3splt is a free command-line utility that allows you to split mp3 and ogg files from several splitpoints, without need of decoding and reencoding.

Extract first 20 minutes from your file:

mp3splt -f original.mp3 0.0 20.0

mp3DirectCut is for Windows. But the website states that it should work on Linux with Wine.

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