[ BASH ] create a video if not exist and append a series of image to this video taken from WEB (input working directory)

append_video.sh

#/bin/bash
#title         :append_new_picture.sh
#author		   :Bertrand Martel
#date          :16/08/2015
#description   :create video if not exist and append a series of image to this video taken from WEB

if [ -z $1 ]
then
	echo "output directory is required"
	exit
fi

WORKING_DIR=$1
OUTPUT_FILE_NAME="video_space"
OUTPUT_FILE_PATH="$WORKING_DIR/$OUTPUT_FILE_NAME.avi"
TEMPORARY_FILE_NAME="temp_space"
TEMPORARY_FILE_NAME_VIDEO="temp_video"

declare -a PICTURE_ARRAY=("https://upload.wikimedia.org/wikipedia/commons/4/4e/Anttlers101.jpg" \
	"https://upload.wikimedia.org/wikipedia/commons/3/3b/NASA-SpiralGalaxyM101-20140505.jpg" \
	"https://upload.wikimedia.org/wikipedia/commons/b/b0/Supernova_in_M101_2011-08-25.jpg" \
	"http://1.1.1.5/bmi/images.nationalgeographic.com/wpf/media-live/photos/000/061/cache/earth-full-view_6125_990x742.jpg")

cd $WORKING_DIR
rm -rf $OUTPUT_FILE_PATH
rm -rf $TEMPORARY_FILE_NAME.avi
rm -rf $TEMPORARY_FILE_NAME.jpg
rm -rf $TEMPORARY_FILE_NAME_VIDEO.avi

for i in {0..3}
{
	wget ${PICTURE_ARRAY[i]} -O $TEMPORARY_FILE_NAME.jpg

	ffmpeg -nostdin -v verbose -f image2 -pattern_type sequence -start_number 0 -r 1 -i $TEMPORARY_FILE_NAME.jpg -s 1920x1080 $TEMPORARY_FILE_NAME.avi

	rm $TEMPORARY_FILE_NAME.jpg

	if [ -f $OUTPUT_FILE_PATH ];
	then
		# concat this video and former video
		ffmpeg -nostdin -v verbose -i "concat:$OUTPUT_FILE_NAME.avi|$TEMPORARY_FILE_NAME.avi" -c copy $TEMPORARY_FILE_NAME_VIDEO.avi

		rm $TEMPORARY_FILE_NAME.avi
		rm $OUTPUT_FILE_NAME.avi
		mv $TEMPORARY_FILE_NAME_VIDEO.avi $OUTPUT_FILE_NAME.avi
	else
		mv $TEMPORARY_FILE_NAME.avi $OUTPUT_FILE_NAME.avi
	fi
}