:
##########################################################################
# Title      :	showvideoduration - print video duration to standard output
# Author     :	Heiner Steven <heiner.steven@odn.de>
# Date       :	2015-04-12
# Category   :	Video
# Requires   :	ffprobe
# SCCS-Id.   :	@(#) 	1.1 18/05/03
##########################################################################
# Description
#     o	Tested with ffprobe 2.6.1
#     o	ffprobe(1) is part of the ffmpeg(1) package
##########################################################################

PN=`basename "$0"`			# Program name
VER='1.1'

set -u

usage () {
    echo >&2 "$PN - print video file duration to standard output
usage: $PN [-hFs] videofile [videofile ...]
   -s:  print duration in seconds. Default: print time (e.g. \"01:53:29\")
   -F:  continue running even after errors. Default: stop at first error.
   -h:  print this usage summary"
    exit 1
}

msg () { echo >&2 "$PN:" "$@";  }

fatal () { msg "$@"; exit 1; }

##########################################################################
# getduration - print video duration to standard output
##########################################################################

getduration () {
    [ $# -eq 1 ] || fatal "usage: getduration videofile"

    if [ "$OutputFmt" = "seconds" ]
    then
	ffprobe -show_entries format=duration -print_format \
	    	'default=nokey=1:noprint_wrappers=1' "$1" 2>/dev/null |
	    sed 's/[.,].*$//'		# Cut off sub-second parts
    else
	ffprobe "$1" 2>&1 |
	    awk '
		# Example output:
		#    Duration: 00:50:52.08, start: 0.000000, bitrate: 821 kb/s
		$1 == "Duration:" && $2 ~ /:[0-9][0-9]:[0-9][0-9]/ {
		    duration = $2
		    sub(/[.,].*$/, "", duration)	# No sub-second parts
		    print duration
		}
	    '
    fi
}
##########################################################################

ForceRun=false
OutputFmt=time
while getopts :Fhs opt
do
    case "$opt" in
	F)	ForceRun=true;;
	s)	OutputFmt=seconds;;
	h)	usage;;
	?)	usage;;
    esac
done
shift `expr ${OPTIND-1} - 1`

[ $# -lt 1 ] && usage

error=0
for videofile
do
    errormsg=

    [ -s "$videofile" ] || errormsg="empty file '$videofile'"
    [ -r "$videofile" ] || errormsg="cannot read file '$videofile'"

    if [ -z "$errormsg" ]
    then
	duration=`getduration "$videofile"`
	if [ -n "$duration" ]
	then
	    echo "$duration	$videofile"
	else
	    errormsg="could not determine video duration for '$videofile'"
	fi
    fi

    if [ -n "$errormsg" ]
    then
	error=1
	if [ "$ForceRun" != "true" ]
	then
	    msg "ERROR: $errormsg"
	    break
	else
	    msg "WARNING: $errormsg - ignored"
	fi
    fi
done

exit $error