[Webkit-unassigned] [Bug 231598] New: canvas.captureStream results in red video

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231598

            Bug ID: 231598
           Summary: canvas.captureStream results in red video
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: btham at cisco.com
                CC: dino at apple.com

Calling captureStream() on an HTML canvas will give me a MediaStream that I can attach as a source object to a video element. However, when I do this, the resulting video is red.

This only occurs on Safari 15 and Safari Technology Preview. It does not occur on Safari 14.

Here is a JSFiddle that reproduces the issue: https://jsfiddle.net/x8pz4u2y/1/. Click on the "Start" button to start capturing the canvas, which flashes between blue and green every second. Note that you may need to resize the window to get the video element to show in Safari 15 for some reason (which may be a separate bug but my main concern is that the resulting video is red).

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