[Webkit-unassigned] [Bug 235845] New: REGRESSION: iOS 15.4b1 captureStream() as source object to <video> not working

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235845

            Bug ID: 235845
           Summary: REGRESSION: iOS 15.4b1 captureStream() as source
                    object to <video> not working
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rigel at 8thwall.com
                CC: youennf at gmail.com

In iOS 15.4b1 (tested on iPhone 11), using the captureStream() method to set the srcObject of the <video> element is not working, resulting in a black screen.

Minimum repro test: https://webrtc.github.io/samples/src/content/capture/video-video/
Expectation: the video on the left is streamed to the <video> on the right
Result: a black screen instead of the video stream

link to image: https://imgur.com/a/TCRANaP

As a result of this bug, all 8th Wall and Zappar sites are broken impacting major brands including: Marvel, LA Dodgers, Universal Pictures, MGM, Xbox, & More

Example 1: https://aircards.8thwall.app/dodgers/
Example 2: https://idareyou.candymanmovie.com/
More examples: https://www.8thwall.com/8thwall

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