zwalnianie utworu

input=perhaps.mp3
slowdowns="0.95 0.90 0.85 0.80 0.75 0.70 0.60"

# Additional sox options, e.g. "trim 80 30" to extract fragment from 1:20 to 1:50 soxoptions=""

for tempo in $slowdowns; do
output=${input%.mp3}-tempo$tempo.mp3
echo "$tempo slowing down $input to $output"
sox $input $output $soxoptions tempo $tempo
title=$(id3v2 --list $output | awk -F ': ' '/TIT2/ { print $2 }')
percent=$(echo "scale=0; $tempo * 100/1" | bc -l)
id3v2 --song "$title ($percent%)" $output
echo done
done
This will generate files perhaps-tempo0.95.mp3, perhaps-tempo0.90.mp3, etc. Dependencies: SoX for slowing down the audio. I installed it on my Mac with Macports (port "sox") id3v2 for appending the slow down factor to the MP3 ID3V2 title tag. Also installed with Macports (port "id3v2"). za http://stefaanlippens.net/slow-down-charlie-parker-with-sox i jeszcze http://unix.stackexchange.com/questions/29869/converting-multiple-image-files-from-jpeg-to-pdf-format