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#!/bin/sh
# Helper script to ease comparing the PSNR between two video files
# Copyleft 2005 by Matthias Wieser
# Copyleft 2005 by Ivo
# This file comes under GPL, see http://www.gnu.org/copyleft/gpl.html for more
# information on its licensing.
warning_frame_number () {
echo "Files have differing numbers of frames!"
echo "$FILE1 has `ls -1 ${TEMPDIR}/FILE1/*ppm | wc -l` frames,"
echo "$FILE2 has `ls -1 ${TEMPDIR}/FILE2/*ppm | wc -l` frames."
echo "Processing the first `ls -1 ${TEMPDIR}/FILE2/*ppm | wc -l` frames."
}
TEMPDIR="/tmp/psnr_video"
WORKDIR=`pwd`
exit=0
if [[ `which pnmpsnr 2> /dev/null` = "" ]]
then
echo
echo "To use this script you have to install the program \"pnmpsnr\" which is"
echo " included in the netpbm package."
echo
exit=1
fi
if [[ `which bc 2> /dev/null` = "" ]]
then
echo
echo "To use this script you have to install the GNU command line calculator \"bc\"."
echo
exit=1
fi
if [ $# -le 1 ]; then
echo
echo "Usage: `basename $0` <file1> <file2> [<frames>] [<options1>] [<options2>]"
echo
echo " <file1> and <file2> are the files for which the PSNR should be calculated."
echo " [<frames>] is the number of frames to process, starting from frame 1."
echo " [<options1>] are additional MPlayer options for <file1>."
echo " [<options2>] are additional MPlayer options for <file2>."
echo
echo " Be aware that `basename $0` needs a lot of temporary space inside /tmp/."
echo
echo "Example:"
echo " ./`basename $0` ./orig.avi ./test.avi 250 \"\" \"-vf pp=ac\""
echo
exit=1
fi
if [ "$exit" -eq 1 ]; then
exit 1
fi
FILE1=$1
FILE2=$2
LastFrame=-1
if [ $# -ge 3 ]; then
LastFrame=$3
echo
echo "Will process $LastFrame frames."
fi
if [ $# -ge 4 ]; then
FILE1_Options=$4
echo "MPlayer options for ${FILE1}: $FILE1_Options"
fi
if [ $# -ge 5 ]; then
FILE2_Options=$5
echo "Mplayer options for ${FILE2}: $FILE2_Options"
fi
mkdir -p ${TEMPDIR}/FILE1
mkdir -p ${TEMPDIR}/FILE2
### File 1
echo
echo "############## $FILE1 #################"
cd ${TEMPDIR}/FILE1
rm -f *ppm
rm -f *del
if [ $LastFrame -ge 0 ]; then
mplayer $FILE1_Options -frames $LastFrame -nosound -vo pnm ${WORKDIR}/$FILE1 >/dev/null
else
mplayer $FILE1_Options -nosound -vo pnm ${WORKDIR}/$FILE1 > /dev/null
fi
### File 2
echo
echo "############## $FILE2 #################"
cd ${TEMPDIR}/FILE2
rm *ppm 2> /dev/null
if [ $LastFrame -ge 0 ]; then
mplayer $FILE2_Options -frames $LastFrame -nosound -vo pnm ${WORKDIR}/$FILE2 >/dev/null
else
mplayer $FILE2_Options -nosound -vo pnm ${WORKDIR}/$FILE2 >/dev/null
fi
### PSNR
echo
echo "############## PSNR Calculation #################"
if [[ `ls -1 ${TEMPDIR}/FILE1/*ppm | wc -l` = `ls -1 ${TEMPDIR}/FILE2/*ppm | wc -l` ]]
then
echo
else
warning_frame_number
echo
fi
cd ${TEMPDIR}/FILE2
#rm ../psnr.dat
echo "File;Y;Cb;Cr" >../psnr.dat
echo "0" > errorsum.del
i=0
for FILE in `ls -1 *.ppm`
do
echo $FILE
echo -n "$FILE">>../psnr.dat
echo -n ";">>../psnr.dat
YCBCR=`pnmpsnr ../FILE1/$FILE $FILE 2>&1 | tail -n 3 | cut -f 3 -d ':' | \
( read Y X; read CB X; read CR X; echo "$Y;$CB;$CR;")`
Y=`echo $YCBCR | cut -f 1 -d ';'`
CB=`echo $YCBCR | cut -f 2 -d ';'`
CR=`echo $YCBCR | cut -f 3 -d ';'`
echo $YCBCR >>../psnr.dat
ALL=`echo "(-10)*l((e(-$Y/10*l(10))+e(-$CB/10*l(10))/4+e(-$CR/10*l(10))/4)/1.5)/l(10)"|bc -l`
echo "$ALL">>../psnr.dat
ERROR=`echo "scale=30; (e(-1*$Y/10*l(10))+e(-1*$CB/10*l(10))/4+e(-1*$CR/10*l(10))/4)/1.5"|bc -l`
ERRORSUM=`cat errorsum.del`
echo `echo "scale=30; $ERROR + $ERRORSUM"|bc -l` > errorsum.del
i=$(($i+1))
if [[ $i = $LastFrame ]]
then
break
fi
done
ERRORSUM=`cat errorsum.del`
PSNR=`echo "-10*l($ERRORSUM/$i)/l(10)" | bc -l`
echo "PSNR:;$PSNR">>../psnr.dat
cd ..
mv psnr.dat ${WORKDIR}/
if [[ `ls -1 ${TEMPDIR}/FILE1/*ppm | wc -l` = `ls -1 ${TEMPDIR}/FILE2/*ppm | wc -l` ]]
then
echo
else
warning_frame_number
echo
fi
cd ..
rm -r ${TEMPDIR}
echo "Created ${WORKDIR}/psnr.dat"
echo
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