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Node.js FFMPEG Example to Pipe Output of Processing Using Stdout in Command Line

var ffmpeg = spawn(argv.ffmpeg, [
    '-i', argv.file,
    '-f', 's16le', // PCM 16bits, little-endian
    '-ar', '44100', // Sampling rate
    '-ac', 2, // Stereo
    'pipe:1' // Output on stdout
  ]);