Why is WebRTC remote video source generated by URL.createObjectURL

Question

In this document, it uses URL.createObjectURL to set the video source. (This is the code to answer a call).

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Answer 1

Because a WebRTC connection involves several steps and what you get from such a connection is a stream. But the src property of the video tag does not accept a stream, but a URL. And this is the way to "convert" a stream to a URL.