Update: working example near bottom. This depends greatly on which browser you are using at the moment, due to an evolving spec. In the specification and Firefox, peer connections are now fundamentally track-based, and do not depend on local stream associations. You have var sender = pc.addTrack(track, stream), pc.removeTrack(sender), and even sender.replaceTrack(track), the latter involving … Read more
This example currently only fully works on FireFox, since chrome simply stops the canvas stream when the tab is blurred… (probably related to this bug, but well, my timer seems to be working but not the recording…) [Edit]: it actually now works only in chrome, since they have fixed this bug, but not anymore in … Read more
Is it possible to create a MediaStream containing MediaStreamTrack instances from two different sources/elements? Yes, you can do it using the MediaStream.addTrack() method. But Firefox will only use the initial stream’s tracks into the Recorder until this bug has been fixed. OP already known how to get all of it, but here is a reminder … Read more