cut audio files with ffmpeg

To create an mp3 file of the first 30s of an existent mp3 file, just use the following command.

ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3

In case the original format is not mp3 you can use instead

ffmpeg -t 30 -i inputfile.webm -acodec libmp3lame -aq 4  outputfile.mp3

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