setup motion in raspbian

1. sudo apt install motion
2. edit /etc/default/motion,
   start_motion_daemon=yes
3. edit /etc/motion/motion.conf
   output_pictures on
   locate_motion_mode on
   picture_filename %Y%m%d/%H/%M%S-%q
   stream_localhost off
   stream_port 8081
   webcontrol_localhost off
   # stream_nrt 8081
   ffmpeg_output_movies off
4. sudo systemctl restart motion