UserAgent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36

Steps to reproduce the problem:
1. Extract the ZIP

2. Run the following:

path\to\chrome.exe --user-data-dir=tmp --load-extension="path\to\tab-capture-fail" "https://www.youtube.com/embed/0vrdgDdPApQ?autoplay=0&modestbranding=1&showinfo=0&controls=0"

3. Click play in the center

4. Double click "pickme" tab

5. Open the chrome://extensions, enable developer mode, view the background page of the extension, and check the console in dev tools

6. Confirm that in Chrome 63.0.3223.8 this fails with the following:

  Uncaught DOMException: Failed to execute 'start' on 'MediaRecorder': The MediaRecorder failed to start because there are no audio or video tracks available.
    at navigator.webkitGetUserMedia.stream (chrome-extension://nnmhnpehbnnngbnpionddbmldicfgbfh/background.js:42:17)

but it does not happen in, e.g. Chromium 63.0.3205.0. Instead it prints "Got data N" (where N is the number of bytes) every 8 seconds

What is the expected behavior?
Expect newest dev chrome to succeed like the other one did.

What went wrong?
Not sure. I use puppeteer (with headless as false) and the version it had at 63.0.3205.0 let you record tabs, but my dev channel browser at 63.0.3223.8 fails when trying to record tabs.

Note, if you try to record audio at the same time, the recorder start succeeds but only gives audio data of course.

Did this work before? Yes 63.0.3205.0

Does this work in other browsers? N/A

Chrome version: 63.0.3223.8  Channel: dev
OS Version: 6.3
Flash Version: 

What changed recently to break tab recording?
 

Deleted: tab-capture-fail.zip 2.4 KB

tab-capture-fail.zip 2.4 KB Download