Hook for transcoding video streams using FFMpeg

transcodeVideo.js

var Transcoder = require('stream-transcoder');

module['exports'] = function transcodeVideoStream (hook) {

  var readStream = hook.open(hook.params.video);
  hook.debug('Opening read stream to video');

  hook.res.writeHead(200, {
    "Content-Type": "video/mp4"
  });
  hook.debug('Set Content-Type to video/mp4')

  // The transcoder API is FFMpeg, see: https://www.ffmpeg.org/
  new Transcoder(readStream)
      .maxSize(hook.params.maxWidth, hook.params.maxHeight)
      .videoCodec('h264')
      .videoBitrate(800 * 1000)
      .fps(25)
      .audioCodec('libfaac')
      .sampleRate(44100)
      .channels(2)
      .audioBitrate(128 * 1000)
      .format('mp4')
      /* 
        you can also use custom flags like 'ss' and 'tt' to slice video
        .custom('ss', '20')
        .custom('t', '10')
      */

      .stream().pipe(hook.res);
};

module['exports'].schema = {
  "video": {
    "type": "string",
    "default": "http://hook.io/video/InfinityMirror.mp4",
    "required": true
  },
  "maxHeight": {
    "type": "number",
    "default": 320,
    "required": true
  },
  "maxWidth": {
    "type": "number",
    "default": 240,
    "required": true
  }
};