====== mjpeg-streamer ======
===== インストール =====
  2019/08 以下ではコンパイルエラー
  sudo apt update
  sudo apt install subversion libjpeg-dev imagemagick
  sudo apt install libjpeg8-dev cmake 
  svn co https://svn.code.sf.net/p/mjpg-streamer/code/mjpg-streamer mjpg-streamer
  cd ./mjpg-streamer
  make
  sudo make install
  
  2019/08 以下のものでインストール
  sudo apt-get install -y cmake libv4l-dev libjpeg-dev imagemagick
  git clone https://github.com/jacksonliam/mjpg-streamer.git
  cd mjpg-streamer/mjpg-streamer-experimental
  sudo make install
  sudo cp -r www /var/www

==== 実行 ====
  cd /usr/local/lib/mjpg-streamer/
  sudo ./mjpg_streamer -i "./input_uvc.so -f 10 -r 640x480 -d /dev/video0 -y -n" -o "./output_http.so -w ./www -p 8080"