plot-bitrate

#!/bin/sh
# plot-bitrate

check_file() {
	if [ ! -s "${1}" ]
	then
		echo "ERROR: \"${1}\" does not exist or is empty"
		exit 1
	fi
}

media_file="${1}"
check_file "${media_file}"
width="${2:-1920}"
height="${3:-1080}"
media_name="$(basename "${media_file}")"
data_file="${HOME}/.plot-bitrate_"${media_name}"_data.$$"
streams_file="${HOME}/.plot-bitrate_"${media_name}"_streams.$$"

libav-bitrate -P -e -I 1 "${media_file}" 2>&1 > "${data_file}"|tee /dev/tty|\
sed -n -e '/^[[:space:]]*Stream/s|^[[:space:]]*||p' > "${streams_file}"

for i in "${data_file}" "${streams_file}"
do
	check_file "${i}"
done

{
echo "
set title \"${media_name}\"
set xdata time
set timefmt '%s'
set format x '%R'
set xlabel 'time'
set ylabel 'bitrate (Kb/s)'
set style data lines

set terminal qt size ${width},${height}
"
echo -n 'plot "'"${data_file}"'" using 1:($2/1024) title "Total"'
stream_n='2'
while read line
do
	stream_n="$((${stream_n}+1))"
	echo -n ', "'"${data_file}"'" using 1:($'"${stream_n}"'/1024) title "'"${line}"'"'
done < "${streams_file}"
echo
}|gnuplot --persist
rm "${data_file}" "${streams_file}"