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#!/usr/bin/env sh
# Description: Create an mp3 ringtone out of an audio file in any format
# Needs user to provide start and end where to cut the file
# Input file audio.ext results in audio_ringtone.mp3
#
# Tip: To convert a complete media file, set start as 0 and
# the runtime of the file as end.
#
# Requires: date, ffmpeg
#
# Shell: POSIX compliant
# Author: Arun Prakash Jana
if [ -n "$1" ]; then
printf "start (hh:mm:ss): "
read -r start
st=$(date -d "$start" +%s) || exit 1
printf "end (hh:mm:ss): "
read -r end
et=$(date -d "$end" +%s) || exit 1
if [ "$st" -ge "$et" ]; then
printf "error: start >= end "
read -r _
exit 1
fi
interval=$(( et - st ))
outfile=$(basename "$1")
outfile="${outfile%.*}"_ringtone.mp3
ffmpeg -i "$1" -ss "$start" -t "$interval" -vn -sn -acodec libmp3lame -q:a 2 "$outfile"
fi
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