puppeteer screen capture demo. Currently records 10 second video. Change the timeout in background.js with your own logic to stop the recording when necessary. Try with `node export.js`

background.js

/* global chrome, MediaRecorder, FileReader */

chrome.runtime.onConnect.addListener(port => {
  let recorder = null
  port.onMessage.addListener(msg => {
    console.log(msg);
    switch (msg.type) {
      case 'REC_STOP':
        console.log('Stopping recording')
        if (!port.recorderPlaying || !recorder) {
          console.log('Nothing to stop')
          return
        }
        port.recorderPlaying = false    
        recorder.stop()    
        break
      case 'REC_CLIENT_PLAY':
        if (port.recorderPlaying) {
          console.log('Ignoring second play, already playing')
          return
        }
        port.recorderPlaying = true
        const tab = port.sender.tab
        tab.url = msg.data.url
        chrome.desktopCapture.chooseDesktopMedia(['tab', 'audio'], streamId => {
          // Get the stream
          navigator.webkitGetUserMedia({
            audio: false,
            video: {
              mandatory: {
                chromeMediaSource: 'desktop',
                chromeMediaSourceId: streamId,
                minWidth: 1280,
                maxWidth: 1280,
                minHeight: 720,
                maxHeight: 720,
                minFrameRate: 60,
              }
            }
          }, stream => {
            var chunks=[];
            recorder = new MediaRecorder(stream, {
                videoBitsPerSecond: 2500000,
                ignoreMutedMedia: true,
                mimeType: 'video/webm'
            });
            recorder.ondataavailable = function (event) {
                if (event.data.size > 0) {
                    chunks.push(event.data);
                }
            };

            recorder.onstop = function () {
                var superBuffer = new Blob(chunks, {
                    type: 'video/webm'
                });

                var url = URL.createObjectURL(superBuffer);
                // var a = document.createElement('a');
                // document.body.appendChild(a);
                // a.style = 'display: none';
                // a.href = url;
                // a.download = 'test.webm';
                // a.click();

              chrome.downloads.download({
                url: url,
                //filename: "suggested/filename/with/relative.path" // Optional
              });
            }

            recorder.start();

            setTimeout(()=>{
                recorder.stop()
            }, 10000)
          }, error => console.log('Unable to get user media', error))
        })
        break
      default:
        console.log('Unrecognized message', msg)
    }
  })
})

content_script.js

window.onload = () => {
  if (window.recorderInjected) return
  Object.defineProperty(window, 'recorderInjected', { value: true, writable: false })

  // Setup message passing
  const port = chrome.runtime.connect(chrome.runtime.id)
  port.onMessage.addListener(msg => window.postMessage(msg, '*'))
  window.addEventListener('message', event => {
    // Relay client messages
    if (event.source === window && event.data.type && event.data.type.startsWith('REC_CLIENT_')) {
      port.postMessage(event.data)
    }
  })

  document.title = 'pickme'
  window.postMessage({ type: 'REC_CLIENT_PLAY', data: { url: window.location.origin } }, '*')
}

export.js

const puppeteer           = require('puppeteer');
console.log(__dirname)
var options = {
  headless: false,
  args: [
    '--enable-usermedia-screen-capturing',
    '--allow-http-screen-capture',
    '--no-sandbox',
    '--auto-select-desktop-capture-source=pickme',
    '--disable-setuid-sandbox',
    '--load-extension=' + __dirname,,
    '--disable-extensions-except=' + __dirname,
  ],
  executablePath: 'google-chrome-unstable',
}
puppeteer.launch(options).then(browser=>{
    return browser.pages().then(pages=>{
        var page = pages[0];
        return page.goto('http://tobiasahlin.com/spinkit/', {waitUntil: 'networkidle2'}).then(_=>{
            return page.evaluate(()=>{
                var session = {
                    audio: false,
                    video: {
                        mandatory: {
                            chromeMediaSource: 'screen',
                        },
                        optional: []
                    },
                };
            })
        })
    }).then(_=>{
        // return browser.close()
    })
})

manifest.json

{
  "name": "Video Capture Attempt #1",
  "version": "0.1.0",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"]
  },
  "content_scripts": [{
    "matches": ["<all_urls>"],
    "js": ["content_script.js"],
    "run_at": "document_start"
  }],
  "permissions": [
    "desktopCapture",
    "<all_urls>",
    "downloads"
  ]
}

How to use?

Hey man! are you available for a quick project no more than 5hours task. i am ready to pay for your time to make modification to this script.

Would you mind pointing out the part of this that works around the Screen Sharing Request dialog please? I'm doing a very similar piece and it's a hurdle.

Hey, that's great !
Exactly what I wanted to do since a day.
The only problem I have is that there is banners to say "chrome is actually controlled by puppeteer" and "tab is captured", and so, the size of the window is not the size I defined. Is there a way to hide the banners ? Or to record the viewport without consideration to the window size ? Or to record headless ?

@ChrisHagan sorry for the late reply but if you notice the document title is set to pickme and auto desktop source selection also set to the same value. This prevents the screen sharing request dialog box.

@Ventricule I have put together an example using xvfb to record headless.
Please check the Example and see if it solves your problem

@muralikg Thank you for Puppetcam ! I did a fork to use without XVFB (not existing on windows) and to add size and length params : https://github.com/Ventricule/puppetcam

Tiny note: Line 11 in export.js has double comma which causes an error since it adds an undefined arg

Thank you