Script that prints AVI file info using mplayer output

I have made some script, so I want to share it with others. It prints some information on multimedia file entered as an argument, parsing output of "mplayer -identify". You can use any file playable by mplayer, but I have tested it with avi and mp3. I tested avi files with video Divx, Xvid, x264, WMV and audio MP3, Ogg, AC3. Here is the script (I call it vfinfo):

#!/bin/bash

if [ "$1" = "-g" ]; then
	OUT=">>/tmp/vfinfo.out"
	FILENAME="$2"
else
	FILENAME="$1"
fi

if [ ! -r "$FILENAME" -o ! -f "$FILENAME" ] ; then
	echo "$0: error accessing file '$FILENAME'"
	exit 1
fi

mplayer -identify -channels 6 -endpos 0 -vc dummy -vo null -ao pcm:file="/dev/null" "$FILENAME" &> /tmp/tmpinfo 
supported=`grep file\ format\ detected /tmp/tmpinfo`
if [ -z "$supported" ] ; then
	echo "$0: file "$FILENAME" is not supported by mplayer"
	exit 2
fi

LENGTH=`grep ID_LENGTH /tmp/tmpinfo | cut -d '=' -f 2`
LENGTH=`echo $LENGTH|cut -d '.' -f 1`
SUBSTRACT_ABR=0

software=`grep " Software:" /tmp/tmpinfo | cut -d ' ' -f 3-`
VIDEO_FORMAT=`grep ID_VIDEO_FORMAT /tmp/tmpinfo | cut -d '=' -f 2`
case "$VIDEO_FORMAT" in
	"avc1" )		
		VIDEO_FORMAT="x264"
		;;
	"DIV3" )
		VIDEO_FORMAT="DivX 3"
		;;
	"DIV4" )
		VIDEO_FORMAT="DivX 4"
		;;
	"DX50" )
		VIDEO_FORMAT="DivX 5"
		;;
	"XVID" )
		VIDEO_FORMAT="XviD"
		;;
esac

VIDEO_BITRATE=`grep ID_VIDEO_BITRATE /tmp/tmpinfo | cut -d '=' -f 2`
if [ $VIDEO_BITRATE ] ; then
	VIDEO_BITRATE=$[$VIDEO_BITRATE/1000]
fi
if [ "$VIDEO_BITRATE" = "0" ] ; then
	FILE_SIZE=`ls -l "$1" | awk '{print $5}'`
	FILE_SIZE=$[$FILE_SIZE/125]
	VIDEO_BITRATE=$[$FILE_SIZE/$LENGTH]
	SUBSTRACT_ABR=1
fi


VIDEO_FPS=`grep ID_VIDEO_FPS /tmp/tmpinfo | head -1 | cut -d '=' -f 2`
VIDEO_WIDTH=`grep ID_VIDEO_WIDTH /tmp/tmpinfo | head -1 | cut -d '=' -f 2`
VIDEO_HEIGHT=`grep ID_VIDEO_HEIGHT /tmp/tmpinfo | head -1 | cut -d '=' -f 2`

AUDIO_FORMAT=`grep ID_AUDIO_FORMAT /tmp/tmpinfo | cut -d '=' -f 2`
case "$AUDIO_FORMAT" in
	"85" )
		AUDIO_FORMAT="MP3"
		;;
	"8192" )
		AUDIO_FORMAT="AC3"
		;;
	"vrbs" )
		AUDIO_FORMAT="Vorbis"
		;;
	"353" )
	    AUDIO_FORMAT="WMA"
		;;
	"28781" )
    	AUDIO_FORMAT="AAC"
		;;
esac
AUDIO_BITRATE=`grep ID_AUDIO_BITRATE /tmp/tmpinfo | head -1 | cut -d '=' -f 2`
if [ "$AUDIO_BITRATE" = "0" ] ; then
	AUDIO_BITRATE=`grep ID_AUDIO_BITRATE /tmp/tmpinfo | tail -1 | cut -d '=' -f 2`
fi
AUDIO_BITRATE=$[$AUDIO_BITRATE/1000]
if [ "$SUBSTRACT_ABR" = "1" ] ; then
	VIDEO_BITRATE=$[$VIDEO_BITRATE-$AUDIO_BITRATE]
fi

AUDIO_NCH=`grep ID_AUDIO_NCH /tmp/tmpinfo | tail -1 | cut -d '=' -f 2`
AUDIO_RATE=`grep ID_AUDIO_RATE /tmp/tmpinfo | tail -1 | cut -d '=' -f 2`

eval echo Filename: \"`basename "$FILENAME"`\" $OUT
eval echo Software: \"$software\" $OUT

if [ "$VIDEO_FORMAT" ] ; then
	eval echo Video: $VIDEO_FORMAT ${VIDEO_BITRATE}kb/s, ${VIDEO_FPS}fps, ${VIDEO_WIDTH}x${VIDEO_HEIGHT} $OUT
fi
if [ "$AUDIO_FORMAT" ] ; then
	eval echo Audio: $AUDIO_FORMAT ${AUDIO_BITRATE}kb/s, $AUDIO_NCH channels, ${AUDIO_RATE}Hz $OUT
fi

hours=$[$LENGTH/3600]
minutes=$[($LENGTH-3600*$hours)/60]
seconds=$[$LENGTH-3600*$hours-60*$minutes]
eval echo "Duration: $hours:$minutes:$seconds" $OUT

if [ "$OUT" ]; then
	if [ -x /usr/bin/Xdialog ]; then
		Xdialog --textbox /tmp/vfinfo.out 12 50
	elif [ -x /usr/bin/zenity ]; then
		zenity --text-info --filename /tmp/vfinfo.out
	elif [ -x /usr/bin/kdialog ]; then
		kdialog --textbox /tmp/vfinfo.out 12 50
	fi
	rm /tmp/vfinfo.out
fi

rm /tmp/tmpinfo

UPDATE 2007-08-03: Added checks if file exists and is supported by mplayer.
UPDATE 2007-08-04: Added support for graphical output via -g option.
UPDATE 2007-10-10: Fixed bug about error message when filename or software string contains special characters.

very cool, good for you for thinking to share with the LQ community!

cheers