Speed up a bunch of MP3 using ffmpeg

gistfile1.bat

for %i in (input/*.mp3) do @ffmpeg -i "input/%i" -filter:a "atempo=1.33" -vn "%i"

gistfile2.sh

for f in input/*.mp3 ; do ffmpeg -i "$f" -filter:a 'atempo=1.33' -vn "${f#input/}" ; done

respekt-prepare.sh

#!/usr/bin/env bash
if [[ $# != 1 ]]; then
	echo "Usage: $0 <respekt-nn-yyyy.zip>"
	exit 1
fi

path=$(realpath $1)
outdir=${1%.zip}

pushd /var/tmp >/dev/null
	echo "Extracting $1..."
	unzip $path -d $outdir || exit 1
	cd $outdir 

	# Put unprocessed files aside
	mkdir unprocessed && mv *.mp3 unprocessed
	# Exclude last file in the playlist
	excluded=$(tr -d "\r" < playlist.pls | perl -ne 'm/^File\d+=(.+\n?)/ && print $1' - | tail -1)
	mv "unprocessed/$excluded" . || exit 1

	echo 'Processing files...'
	# Process the files
	for f in unprocessed/*.mp3; do
		ffmpeg -i "$f" -filter:a 'atempo=1.33' -vn "${f#unprocessed/}" || exit 1
	done

	echo 'Cleaning up...'
	# Clean up original files
	rm -r unprocessed
popd >/dev/null

# Move processed files into current directory
mv /var/tmp/$outdir . || exit 1

echo
echo "Done. Processed files are in $outdir"
echo "You may want to rmove the original $1 later"