record-stream

#!/bin/bash

# URL of the stream
url=$1

# How long to record in seconds
length=$2

# Where to store the recording
file=$3

# Calculate end time.
end=$(( $(date +%s) + length))

# While end time is not reached
while (( $(date +%s) < end )); do 
	echo "starting to record"
	curl -s  $url --retry 10 --retry-max-time 60 --max-time $(( fin - $(date +%s) )) >> $file & pid=$!
	sleep 5 # initial delay to let curl start recording
	#check curl is writing to file, i.e. stream didn't block
	while (( $(date +%s) - $(date +%s -r $file) < 5 )); do 
		sleep 5; 
	done

	echo "it seems curl blocked, killing it to restart it"
	kill $pid
done