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Script to create an MPEG-4 (.mp4) video from PNG-format images

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Chris Greenshields
Chris Greenshields committed May 15, 2015
1 parent 966c159 commit 29394db3d3bf192eda8e3e885c4a30d53e6f396a
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#!/bin/sh
#------------------------------------------------------------------------------
# ========= |
# \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
# \\ / O peration |
# \\ / A nd | Copyright (C) 2015 OpenFOAM Foundation
# \\/ M anipulation |
#-------------------------------------------------------------------------------
# License
# This file is part of OpenFOAM.
#
# OpenFOAM is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
#
# Script
# foamCreateVideo
#
# Description
# Creates an MPEG-4 compressed (.mp4) video file from PNG images
# - requires mencoder
#
#------------------------------------------------------------------------------

usage () {
exec 1>&2
while [ "$#" -ge 1 ]; do echo "$1"; shift; done
cat <<USAGE
Usage: ${0##*/} [OPTIONS] ...
options:
-d | -dir <dir> directory containing png images (default local dir)
-f | -fps <fps> frames per second (default = 10)
-h | -help help
-i | -image <name> name of image sequence (default = image)
-o | -out <name> name of output video file (default = video)
Creates an MPEG-4 compressed (.mp4) video file from a sequence of PNG images
- A sequence named "image" will expect files image.0000.png, image.0001.png, etc
- An output video named "video" will produce a file video.mp4
- By default the video codec is high resolution (x264) but there is an option to
select a medium resolution codec (lavc)
Requires mencoder
USAGE
exit 1
}


# Default settings
DIR='.'
IMAGE='image'
VIDEO='video'
FPS=10
VCODEC=x264


while [ "$#" -gt 0 ]
do
case "$1" in
-h | -help)
usage
;;
-d | -directory)
[ "$#" -ge 2 ] || usage "'$1' option requires an argument"
DIR=$2
shift 2
;;
-f | -fps)
[ "$#" -ge 2 ] || usage "'$1' option requires an argument"
FPS=$2
shift 2
;;
-i | -image)
[ "$#" -ge 2 ] || usage "'$1' option requires an argument"
IMAGE=$2
shift 2
;;
-o | -out)
[ "$#" -ge 2 ] || usage "'$1' option requires an argument"
VIDEO=$2
shift 2
;;
-*)
usage "invalid option '$1'"
;;
*)
break
;;
esac
done

#
# MAIN
#

[ -f "$(ls -1 $DIR/$IMAGE.*.png | head -1)" ] || usage "Cannot find first file in image sequence"

if command -v mencoder >/dev/null 2>&1; then
mencoder \
"mf://$DIR/$IMAGE.*.png" \
-mf fps=$FPS \
-o $VIDEO.mp4 \
-ovc $VCODEC
else
usage "Please install mencoder"
fi

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