[Webkit-unassigned] [Bug 242072] New: Drawing video in canvas plays with low frame rate

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jun 28 11:30:20 PDT 2022


            Bug ID: 242072
           Summary: Drawing video in canvas plays with low frame rate
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: danielchasehooper at gmail.com
                CC: dino at apple.com

Created attachment 460520

  --> https://bugs.webkit.org/attachment.cgi?id=460520&action=review

files to reproduce the bug

video elements drawn into a canvas (2d or webgl, doesn't matter) has very stuttery playback. video in the canvas will display only every ~4th frame.

the attached zip contains an html file that reproduces the issue - serve the html file with a local server and visit in safari. The 2d canvas and webgl canvas will both show the video stuttering, while the <video> element will play back smoothly. Firefox and Chrome both play the video smoothly in both canvas types.

Reproduced on 
safari technology preview 147 
Safari 15.5
macOS 12.4
2021 14" MacBook pro

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