ffmpeg

Cut an audio file

ffmpeg -i file.m4a -vn -acodec copy -ss 00:00:15 -t 00:04:55 cut_file.m4a

Conert m4a to mp3 (Bad Idea)

ffmpeg -i {}.m4a -b:a 192K -vn {}.mp3

More options: https://amiaopensource.github.io/ffmprovisr/

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