[Webkit-unassigned] [Bug 258060] New: The quality of video encode by VideoEncoder of Webcodecs on mac safari is poor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258060

            Bug ID: 258060
           Summary: The quality of video encode by VideoEncoder of
                    Webcodecs on mac safari is poor
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: chillineditor at gmail.com

I just use VideoEncoder of Webcodecs API provided by Safari 16.4 to encode video, The quality of the encoded video is poor on Mac Safari but it is normal on other platforms such as Mac Chrome, iOS Chrome, iOS Safari, and Android Chrome.

Video samples:
https://chillin.online/images/webcodec-sample-mac-safari.mp4
https://chillin.online/images/webcodec-sample-mac-chrome.mp4

More Details:
The quality of video seems to decay over time, I find this bug on mac based on Intel chip, The VideoEncoder config is 
const config = {
  codec: 'avc1.640034',
  width: 1280,
  height: 720,
  framerate: 30,
  hardwareAcceleration: 'prefer-software' as const,
  avc: { format: 'avc' as const }
};

Looking forward to your feedback on this bug, my email is chillineditor at gmail.com.

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