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Adds the script psnr-video.sh to calculate the PSNR between two existing video files.
Script by Matthias Wieser < mwieser AH gmx POUM de > Original thread: Date: Aug 25, 2005 1:54 PM Subject: [MEncoder-users] [Script] PSNR between two video files git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16463 b3059339-0415-0410-9bf9-f77b7e298cf2
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45
TOOLS/README
45
TOOLS/README
@ -254,6 +254,51 @@ Note: Requires gnuplot. Comparison is based on file2. Comparison
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assumes that the frame numbers of both files fit.
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psnr-video.sh
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Author: Matthias Wieser
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Description: Calculates the PSNR between two existing video files.
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The PSNR is calculated frame by frame.
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Prints also the overall PSNR.
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The script can be used to:
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* compare different softwarescalers (should I use
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-sws 1 or -sws 2) ?
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* compare different resolutions (is it better to scale
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down to 640x360 or to 560x320)
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* compare different deinterlacers
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* compare different video codecs
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* compare video filters (is it better to use -vf hqdn3d
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or lavcopts:nr=400)
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* [...]
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Usage: psnr-video.sh <file1> <file2> [<frames>] [<options1>] [<options2>]
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<file1> and <file2> are the video files for which the PSNR
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should be calculated.
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[<frames>] is the number of frames to process, starting
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from frame 1.
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[<options1>] are additional MPlayer options for <file1>
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[<options2>] are additional MPlayer options for <file2>
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A file called psnr.dat will be created with the following
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content:
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File;Y;Cb;Cr
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00000001.ppm;34.23;39.54;40.06;35.426
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00000002.ppm;33.03;38.71;39.26;34.271
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00000003.ppm;33.45;38.91;39.28;34.655
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00000004.ppm;32.72;38.69;38.85;33.972
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[...]
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00000247.ppm;35.55;40.84;42.15;36.785
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PSNR:;35.9887
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Note: This script relies on the the tool "pnmpsnr" for the
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frame-by-frame PSNR calculation.
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Be aware that psnr-video.sh needs a lot of temporal space
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inside /temp/.
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asfinfo
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Author: Arpi
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150
TOOLS/psnr-video.sh
Executable file
150
TOOLS/psnr-video.sh
Executable file
@ -0,0 +1,150 @@
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#!/bin/sh
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# Helper script to ease comparing two video files
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# Copyleft 2001 by Matthias Wieser
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# This file comes under GPL, see http://www.gnu.org/copyleft/gpl.html for more
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# information on it's licensing.
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TEMPDIR="/tmp/psnr_video"
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WORKDIR=`pwd`/
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if [ $# -le 1 ]; then
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echo
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echo "Usage: `basename $0` <file1> <file2> [<frames>] [<options1>] [<options2>]"
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echo
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echo " <file1> and <file2> are the video files for which the PSNR should be calculated."
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echo " [<frames>] is the number of frames to process, starting from frame 1."
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echo " [<options1>] are additional MPlayer options for <file1>"
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echo " [<options2>] are additional MPlayer options for <file2>"
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echo
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echo " Be aware that `basename $0` needs a lot of temporal space inside /temp/."
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echo
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echo "Example:"
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echo " ./`basename $0` ./orig.avi ./test.avi 250 \"\" \"-vf pp=ac\""
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echo
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exit 1
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fi
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FILE1=$1
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FILE2=$2
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LastFrame=-1
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if [ $# -ge 3 ]; then
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LastFrame=$3
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echo
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echo "Will process $LastFrame frames"
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fi
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if [ $# -ge 4 ]; then
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FILE1Opts=$4
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echo "Mplayer options for ${FILE1}: $FILE1Opts"
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fi
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if [ $# -ge 5 ]; then
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FILE2Opts=$5
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echo "Mplayer options for ${FILE2}: $FILE2Opts"
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fi
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mkdir -p ${TEMPDIR}/FILE1
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mkdir -p ${TEMPDIR}/FILE2
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### File 1
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echo
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echo "############## $FILE1 #################"
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cd ${TEMPDIR}/FILE1
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rm *ppm 2> /dev/null
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rm *del 2> /dev/null
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if [ $LastFrame -ge 0 ]; then
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mplayer $FILE1Opts -frames $LastFrame -nosound -vo pnm ${WORKDIR}$FILE1 >/dev/null
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else
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mplayer $FILE1Opts -nosound -vo pnm ${WORKDIR}$FILE1 >/dev/null
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fi
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### File 2
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echo
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echo "############## $FILE2 #################"
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cd ${TEMPDIR}/FILE2
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rm *ppm 2> /dev/null
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if [ $LastFrame -ge 0 ]; then
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mplayer $FILE2Opts -frames $LastFrame -nosound -vo pnm ${WORKDIR}$FILE2 >/dev/null
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else
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mplayer $FILE2Opts -nosound -vo pnm ${WORKDIR}$FILE2 >/dev/null
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fi
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### PSNR
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echo
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echo "############## Calculation PSNR #################"
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if [[ `ls -1 ${TEMPDIR}/FILE1/*ppm|wc -l` = `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` ]]
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then
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echo
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else
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echo "Files have differing numbers of frames!"
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echo "$FILE1 has `ls -1 ${TEMPDIR}/FILE1/*ppm|wc -l` frames,"
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echo "$FILE2 has `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` frames."
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echo "Processing the first `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` frames."
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echo
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fi
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cd ${TEMPDIR}/FILE2
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#rm ../psnr.dat
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echo "File;Y;Cb;Cr" >../psnr.dat
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echo "0" > errorsum.del
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i=0
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for FILE in `ls -1 *.ppm`
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do
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echo $FILE
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echo -n "$FILE">>../psnr.dat
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echo -n ";">>../psnr.dat
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pnmpsnr ../FILE1/$FILE $FILE 2> del.del
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grep "Y" del.del | dd bs=1c count=5 skip=29 of=del2.del 2>/dev/null
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Y=`cat del2.del`
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echo -n "$Y;">>../psnr.dat
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grep "Cb" del.del | dd bs=1c count=5 skip=29 of=del2.del 2>/dev/null
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CB=`cat del2.del`
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echo -n "$CB;">>../psnr.dat
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grep "Cr" del.del | dd bs=1c count=5 skip=29 of=del2.del 2>/dev/null
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CR=`cat del2.del`
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echo -n "$CR;">>../psnr.dat
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ALL=`echo "(-10)*l((e(-$Y/10*l(10))+e(-$CB/10*l(10))/4+e(-$CR/10*l(10))/4)/1.5)/l(10)"|bc -l`
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echo "$ALL">>../psnr.dat
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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`
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ERRORSUM=`cat errorsum.del`
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echo `echo "scale=30; $ERROR + $ERRORSUM"|bc -l` > errorsum.del
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i=$(($i+1))
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if [[ $i = $LastFrame ]]
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then
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break
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fi
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done
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ERRORSUM=`cat errorsum.del`
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PSNR=`echo "-10*l($ERRORSUM/$i)/l(10)"|bc -l`
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echo "PSNR:;$PSNR">>../psnr.dat
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cd ..
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mv psnr.dat ${WORKDIR}
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if [[ `ls -1 ${TEMPDIR}/FILE1/*ppm|wc -l` = `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` ]]
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then
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echo
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else
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echo "Files have differing numbers of frames!"
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echo "$FILE1 has `ls -1 ${TEMPDIR}/FILE1/*ppm|wc -l` frames,"
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echo "$FILE2 has `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` frames."
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echo "Processed the first `ls -1 ${TEMPDIR}/FILE2/*ppm|wc -l` frames."
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echo
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fi
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cd ..
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rm -r ${TEMPDIR}
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echo "Created ${WORKDIR}psnr.dat"
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echo
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