[Webkit-unassigned] [Bug 229792] New: <video> element rendered incorrectly when provided with a portrait orientation stream in Safari 15

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229792

            Bug ID: 229792
           Summary: <video> element rendered incorrectly when provided
                    with a portrait orientation stream in Safari 15
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: alex at khovansky.me

Created attachment 437113

  --> https://bugs.webkit.org/attachment.cgi?id=437113&action=review

Bug screenshot in codepen debug view

<video> element with vertical video appears to be rendered with a black landscape-oriented rectangle behind it.
First noticed when using getUserMedia on iPhone in iOS 15 (19A5340a). Same issue is reproducible on iPadOS 15 (same build) when used in portrait mode.

Reproduction codepen: https://codepen.io/alx-khovansky/pen/PojNgqR
Attached a screenshot taken in codepen debug view, notice the black rectangle sticking from the sides of the video.

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