[Webkit-unassigned] [Bug 191248] New: there is no video when switch the video source from external camera to internal camera(FaceTime HD Camera) in safari 12 in macOS10.14

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191248

            Bug ID: 191248
           Summary: there is no video when switch the video source from
                    external camera to internal camera(FaceTime HD Camera)
                    in safari 12 in macOS10.14
           Product: WebKit
           Version: Safari 12
          Hardware: PC
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xpeng1984 at gmail.com
                CC: youennf at gmail.com

demo :
https://webrtc.github.io/samples/src/content/devices/input-output/

Case :
OS : macOS 10.14   , Browser : Safari 12/Safari Preview Release 58
Steps:
1. Select the “FaceTime HD Camera” for the Video source ， there is video in the demo page.
2. Select the External Camera for the Video source ， there is video in the demo page.
3. Select the “FaceTime HD Camera” for the Video source , there is no video in the demo page

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