Shell script for audio recording

Esse artigo está disponível em português.

One of my favourite radio shows happens every day at 10 AM (Brasilia Timezone). I was unable to listen to it because the time zones. Then, I created the following small shell script to record the show and then I can listen to it in my free time.
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#!/bin/bash
 
# paths
TIMELIMIT="timelimit"
LIVESTREAMER="livestreamer"
FFMPEG="ffmpeg"
 
# parameters
IN=$1
OUT=$2
TIME=$3
if [[ -z $TIME ]]; then TIME="3600"; fi
 
if [ $# -lt 1 ]; then
	echo -n "Usage: $0 url output [time]"
	exit 0
fi
 
if [[ -z `which $TIMELIMIT` ]]; then
	echo "timelimit not found" 1>&2
	exit 1;
fi
 
if [[ -z `which $LIVESTREAMER` ]]; then
	echo "livestreamer not found" 1>&2
	exit 1;
fi
 
if [[ -z `which $FFMPEG` ]]; then
	echo "ffmpeg not found" 1>&2
	exit 1;
fi
 
echo "START STREAMING"
$TIMELIMIT -t $TIME $LIVESTREAMER $IN best -o $OUT.ts
 
echo "CONVERTING FILE TO MP3"
ffmpeg -y -i $OUT.ts -c:a libmp3lame -b:a 64k -joint_stereo 0 $OUT
 
rm $OUT.ts
echo "DONE"

The script uses timelimit, ffmpeg and livestreamer. You can create a cron task to run the script according to necessity. For example:

00 10 * * 1-5 /Users/leonardo/Sites/audio-recorder/98.sh "hlsvariant://http://stream.izap.com.br/live/98fm.stream/playlist.m3u8" "/Users/leonardo/Downloads/central98.mp3" 3600

The previous line will record the m3u8 streaming file by 1 hour (3600 seconds) Monday to Friday at 10 AM. If you are not familiar with crontab syntax, use a Crontab Generator.

This post is also published in coderwall.