Simple video conversion and streaming with node.js

gistfile1.js

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

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'video/x-flv'});
  var pathToMovie = '/public/video.mp4';
  var proc = new ffmpeg({ source: pathToMovie, logger: true, nolog: false })
    .toFormat('flv')
    .updateFlvMetadata()
    .withSize('320x?')
    .withVideoBitrate('512k')
    .withVideoCodec('libx264')
    .withFps(24)
    .withAudioBitrate('96k')
    .withAudioCodec('libfaac')
    .withAudioFrequency(22050)
    .withAudioChannels(2)
    // The FFmpeg's "-re" flag means to "Read input at native frame rate. Mainly used to simulate a grab device."
    .addOptions([ '-preset ultrafast', '-re' ])
    .writeToStream(res, function(retcode, error){
      console.log(error);
      console.log('file has been converted succesfully');
    });
}).listen(8181, '127.0.0.1');