HTMLCanvasElement: captureStream() method - Web APIs | MDN

Parameters frameRate Optional A double-precision floating-point value that indicates the rate of capture of each frame. If not set, a new frame will be captured each time the canvas changes; if set to 0, frames will not be captured automatically; instead, they will only be captured when the returned track's requestFrame() method is called. Return value A reference to a MediaStream object, which ha

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CanvasをキャプチャしてRTCPeerConnectionにストリームとして流せる。