4. There are already several similar but not identical questions around: How to "Trim" an Audio File in Java, C# or PHP (For Browser) java mp3/audio editing/trimming library. Crop MP3 to first 30 seconds. and also ways to utilize them: ffmpeg for a android (using tutorial: "ffmpeg and Android.mk") Share. Follow. 1. Download and install ES File Explorer File Manager. There are other file managers that will allow you to create file shortcuts, but for this tip, we’ll use ES File Explorer File Manager for Step 1. Launch VLC Media Player, and import your target MP3 file. Step 2. Next, click "View" on the menu bar, and choose the "Advanced Controls" option. Once done, you will see four new buttons above the playback icon. Step 3. Drag the slider to the position where you want your segment to begin, and click "Shift + R". bpknSc.