[Webkit-unassigned] [Bug 227933] New: applyConstraints recaptures camera and creates a lag

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227933

            Bug ID: 227933
           Summary: applyConstraints recaptures camera and creates a lag
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msach22 at gmail.com
                CC: youennf at gmail.com

When using the applyConstraints API on getUserMedia, it seems like Safari is recapturing from the camera. You will also see a lag in the video rendering each time applyConstraints is called.

I've set up a basic JSFiddle that helps repro this:
https://jsfiddle.net/3jztwxc6/

```

(async () => {

const stream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});
const videoElement = document.getElementById("gum");
videoElement.srcObject = stream;
const videoTrack = stream.getVideoTracks()[0];

const constraints = videoTrack.getConstraints();

constraints.frameRate = { max: 20, min: 20 };

setTimeout(() => {
videoTrack.applyConstraints(constraints);

}, 5000);

})();
```

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