task

cd /home/pi/rmrz/HAP-NodeJS/lib/res

wget http://localhost:8765/picture/1/current/ -O output.jpg
file=output.jpg
minimumsize=5000
actualsize=$(wc -c <"$file")
if [ $actualsize -ge $minimumsize ]; then
    echo image download successful
else
    wget http://localhost:8765/picture/1/current/ -O output.jpg
fi
ffmpeg -i /home/pi/rmrz/HAP-NodeJS/lib/res/output.jpg -vf scale=1280:720 /home/pi/rmrz/HAP-NodeJS/lib/res/snapshot.jpg -y