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#!/usr/local/bin/bash
# convert.sh
# Apply tempo filter to .mp3 files in this and all sub directories
# Optional: Delete original file after conversion

shopt -s globstar
i=1
for song in ./**/*.mp3
do
  ffmpeg -i "$song" -filter:a "atempo=2.0" -vn $i.mp3
  i=$((i+1))
done