capture rtsp and create movie (ffmpeg)

index.sh

# enable multicast route so ffmpeg can resolve 2nd interface data
sudo route add -net 239.0.0.0/8 dev eth0

# grab 1 frame of video as jpg
run-every 60 ffmpeg -i udp://@239.255.42.42:5004 -f image2 -frames:v 1 -strftime 1 "%F-%H-%M-%S.jpg"

# convert jpgs to movie
rm -rf cropped
mkdir cropped
mogrify -path cropped/ -extract 1400x990+0+0 *.jpg
ffmpeg -framerate 50 -f image2 -pattern_type glob -i '*.jpg' -vf fps timelapse.mp4