title: "Invalid or unexpected token" error when trying to execute ffmpeg build on lambda
body: <p>I have a node.js script that uses ffmpeg to convert mp4 downloaded from YT to mp3 and save to Amazon S3. Uploading using the serverless framework. The "ffmpeg" file is included in the main directory (with .yml), downloaded from here:
  <code>https://johnvansickle.com/ffmpeg/</code></p>
  
  <p>The code:</p>
  
  <pre><code>'use strict'
  process.env.PATH = process.env.PATH + ':/tmp/'
  process.env['FFMPEG_PATH'] = '/tmp/ffmpeg';
  const BIN_PATH = process.env['LAMBDA_TASK_ROOT']
  process.env['PATH'] = process.env['PATH'] + ':' + BIN_PATH;
  
  module.exports.download_mp3 = function (event, context, callback)
  {
    require('child_process').exec('cp /var/task/ffmpeg /tmp/.; chmod 755 
    /tmp/ffmpeg;', function (error, stdout, stderr) {
    if (error) 
    {
      console.log('An error occured', error);
      callback(null, null)
    } 
    else 
    {
      var ffmpeg = require('ffmpeg');
      const aws = require('aws-sdk')
      const s3 = new aws.S3()
      const ytdl = require('ytdl-core');
  
      function uploadFromStream(s3) {
        const stream = require('stream')
        var pass = new stream.PassThrough();
  
        var params = {Bucket: "some-bucket", Key: "some-key", Body: pass};
        s3.upload(params, function(err, data) {
          console.log(err, data);
        });
        console.log("Should be finished")
        callback(null)
      }
  
      let stream = ytdl("some-video-id", {
        quality: 'highestaudio',
        filter: 'audioonly'
      });
  
      ffmpeg(stream)
        .audioBitrate(128)
        .format('mp3')
        .on('error', (err) =&gt; console.error(err))
        .pipe(uploadFromStream(s3), {
          end: true
      });
    }})
  }
  </code></pre>
  
  <p>When triggered, the function writes an error in logs: <br/></p>
  
  <pre><code>2019-01-04T14:50:54.525Z    21da4d49-1030-11e9-b901-0dc32b691a16     
  /var/task/ffmpeg:1
  (function (exports, require, module, __filename, __dirname) { ELF
  ^
  
  SyntaxError: Invalid or unexpected token
  at createScript (vm.js:80:10)
  at Object.runInThisContext (vm.js:139:10)
  at Module._compile (module.js:616:28)
  at Object.Module._extensions..js (module.js:663:10)
  at Module.load (module.js:565:32)
  at tryModuleLoad (module.js:505:12)
  at Function.Module._load (module.js:497:3)
  at Module.require (module.js:596:17)
  at require (internal/module.js:11:18)
  at /var/task/download.js:17:18
  </code></pre>
  
  <p>It's, most definetely, an error in the "ffmpeg" file I've mentioned above (link provided). But I don't know what's the exact issue, I followed the first answer here: <code>https://stackoverflow.com/questions/47882810/lambda-not-connecting-to-ffmpeg</code> to include the ffmpeg build.</p>