If you’re watching something in your browser, specifically in Chrome/Chromium, and a desktop solution isn’t something you can set up, there are ways to record audio from within Chrome itself. It’s not a feature of the browser itself. You will need to install a free extension called Chrome Audio Capture.
The extension is simple to use and you won’t have to worry about drivers, audio input/output devices, and re-routing audio streams. It can save the audio in MP3 and WAV format.
See How to record audio from a tab in Chrome
We’ve covered how you can record audio from an app on Windows 10, and on macOS. The process on both platforms is fairly simple and in both cases, you have %