Hello.

While building a web-based video editor, I encountered an issue with handling multiple video tracks in a MediaStream. I wanted to switch between different video sources (desktop and webcam) on a single video element without interrupting the MediaRecorder. Attempting to do this by toggling the 'selected' property on the videoTracks object of the video element failed. The videoTracks array only contains the first video track added to the MediaStream, even though the stream itself contains both tracks. This prevents seamless switching between sources within the video element.