In this whimsical post the author recounts a bicycle ride that inspires a foray into Linux and audio processing; he sets up a RaspberryâŻPi as an inexpensive workstation, installs ffmpeg via apt, and explains how to speedâup an MP3 by 125âŻ% using the atempo filter in the command line: `ffmpeg -i original-song.mp3 -af atempo=1.25 spedup-song.mp3`. He walks through each flag (-i for input, -af for audio filter) and notes that atempo=1.25 means 125âŻ% tempo. The post ends with a short demo of the beforeâandâafter audio and a brief reflection on how the command line can be efficient once you learn its syntax.






















