[Webkit-unassigned] [Bug 236755] New: [compat] seeked event should be fired once the current frame has been displayed.

Wed Feb 16 23:04:07 PST 2022

https://bugs.webkit.org/show_bug.cgi?id=236755

            Bug ID: 236755
           Summary: [compat] seeked event should be fired once the current
                    frame has been displayed.
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com

Consider the following page:

```
<html>
<script>
    async function init()
    {
        let canvas = document.getElementsByTagName('canvas')[0];
        let ms = new MediaSource();
        let v = document.createElement("video");
        v.src = URL.createObjectURL(ms);
        await once(ms, 'sourceopen');
        let videosb = ms.addSourceBuffer("video/webm; codecs=vp8");
        v.currentTime = 1.0;
        await Promise.all([fetchAndLoad(videosb, 'content/test-vp8-hiddenframes', [''], '.webm') , once(v, 'loadedmetadata'), once(v, 'seeked')]);
        canvas.width = v.videoWidth;
        canvas.height = v.videoHeight;
        let ctx = canvas.getContext("2d");
        ctx.drawImage(v, 0, 0);
    }
</script>
<body onload="init();">
<canvas/>
</body>
```

This will create a video element, attach media source, seek to 1s and wait for the seek to complete to then copy the video frame to the canvas.

With Firefox and Chrome, the frame display in the canvas is the video frame at t=1s as expected

However, in Safari, the frame displayed is of t=0s. 
This makes it difficult to create reftest for checking bug 236754 as you can't ever guarantee which frame is currently displayed on screen.

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