[Webkit-unassigned] [Bug 231903] New: Webrtc video streams in portrait have a black background in landscape

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231903

            Bug ID: 231903
           Summary: Webrtc video streams in portrait have a black
                    background in landscape
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: davy.de.durpel at supportsquare.io
                CC: youennf at gmail.com

As of iOS 15 there's a black background behind the video element of a WebRTC stream when holding the phone in portrait.  The black background appears to be the same size as the video element but rendered in landscape.

You can easily see this effect by opening this demo from the WebRTC site:
https://webrtc.github.io/samples/src/content/getusermedia/resolution/

I have this issue on an iPhone Xs running iOS 15.0.2.
I have no idea if it occurs on other devices.

A side effect seems to be that some of the width and height parameters are the ones of the black background (I will need to do some extra debugging in the OpenTok library to confirm this)

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