[Webkit-unassigned] [Bug 241808] New: Using canvas.context.drawImage() in a requestAnimationFrame loop to copy a video yields low frame-rate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241808

            Bug ID: 241808
           Summary: Using canvas.context.drawImage() in a
                    requestAnimationFrame loop to copy a video yields low
                    frame-rate
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dave at defmech.com
                CC: dino at apple.com

When using the canvas context.drawImage() method, in a requestAnimationFrame loop, to copy a video playing at 60fps the canvas does not get updated at 60fps. The resulting canvas appears to update at a much lower framerate compared to the video.

Expected results: The canvas should update at the same rate as the playing video.

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