encoder.js

'use strict';

var ffmpeg = require('fluent-ffmpeg');
var fs = require('fs');

var config = {
  input: 'files',
  output: 'files/encoded'
}

var watcher = fs.watch(config.input);

function m3u8ify (filename) {
  return filename.slice(0, -3) + 'm3u8';
}

watcher.on('change', function (event, filename) {
  // get a stream for the file
  let stream = fs.createReadStream(config.input + '/' + filename);

  // transcode it
  ffmpeg(stream)
    .addOption('-hls_time', 60)
    .addOption('-hls_list_size', 0)
    .on('end', function () {
      console.log('Completed Encoding');
    })

    // I'd like to make this better
    .on('error', function (err, stdout, stderr) {
      console.log('Error:', err);
      console.log('stdout:', stdout);
      console.log('stderr:', stderr);
    })
    // save it in the output dir with the right name
    .save(config.output + '/' + m3u8ify(filename))
});