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#!/bin/bash
shopt -s globstar
if (($# < 1)); then
echo "usage: ${0##*/} <directory>"
exit
fi
if [[ ! -d $1 ]]; then
echo "argument must be a directory"
exit 1
fi
dir=${1%/}
copydir_suffix="_mp3"
# same regex twice, but different replacement pattern
find "$dir" -type f -name '*.flac' -print0 | parallel -0 mkdir -p '{=s#^([^/]+)(.*)/([^/]+)\.flac$#\1'"${copydir_suffix}"'\2#=}'\; ffmpeg -i {} -qscale:a 0 '{=s#^([^/]+)(.*)/([^/]+)\.flac$#\1'"${copydir_suffix}"'\2\3.mp3#=}'
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