TLDR
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wacaw

 
A little command-line tool for macOS that allows you to capture both still pictures and video from an attached camera. More information: http://webcam-tools.sourceforge.net.
 
  • Take a picture from webcam:
     
    wacaw {{filename}}
     
  • Record a video:
     
    wacaw --video {{filename}} --duration {{duration_in_seconds}}
     
  • Take a picture with custom resolution:
     
    wacaw --width {{width}} --height {{height}} {{filename}}
     
  • Copy image just taken to clipboard:
     
    wacaw --to-clipboard
     
  • List the devices available:
     
    wacaw --list-devices

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