[Webkit-unassigned] [Bug 207888] New: getUserMedia camera input broken in Safari iOS 13.3.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207888

            Bug ID: 207888
           Summary: getUserMedia camera input broken in Safari iOS 13.3.1
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com
                CC: youennf at gmail.com

Using getUserMedia for video input appears to be broken in Safari iOS 13.3.1.

The problem is after approving a video request, it captures only a few frames and then freezes.

Repro URL: https://www.scirra.com/labs/cameratest2/index.html
Steps:
1. Press 'Get camera' button
2. Approve the permission request
3. Observe video preview

On iOS 13.3.1 this sporadically fails and causes the video preview to freeze. If you don't see the problem right away, try a couple of times, it usually happens after a few goes. As far as I can tell it works correctly in Chrome on Android and on Safari on macOS, so the problem is specific to iOS 13.

NOTE: I cannot reproduce the issue with a minimal getUserMedia demo displaying the camera directly to a <video> element. Our demo renders the camera input by uploading it to a WebGL texture, which may be related to the problem.

Once the video has frozen, the following actions can restore it back to working again:
a) Switch to a different Safari tab, then switch back again
b) Lock the device, and then unlock it
c) Tap the video icon in the address bar to block the video, and then tap it again to re-enable it

These seem to point to an issue with Safari failing to update the video stream while the camera is still live.

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