[Webkit-unassigned] [Bug 235714] New: Unable to play video/webm; codecs="vp8" generated from Chrome with MSE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235714

            Bug ID: 235714
           Summary: Unable to play video/webm;codecs="vp8" generated from
                    Chrome with MSE
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrvisser at gmail.com

Created attachment 450132

  --> https://bugs.webkit.org/attachment.cgi?id=450132&action=review

Recording example

I'm unable to get a screen recording taken from Chrome (97.0.4692.99) to render on Safari 15.2 (or STP) using MSE. I have had some success opening the resulting webm file using a file:// url, but not consistently (the webm file sent in the attached archive does not work when accessing directly with Safari).

I've attached an archive that has an example use of MSE and webm file generated from a Chrome screen recording that is not playing in Safari, however it plays fine in Chrome/Edge and Firefox.

In addition to a potential bug in Safari here, if there is any advice on how I could possible update the EBML of the file to get it working in Safari as a workaround, that would be greatly appreciated.

To run the example in the archive I take these steps:

```
$ tar -zxvf chrome-recording-for-webkit-issue.tar.gz
$ cd chrome-recording-for-webkit-issue
$ npx http-server
```

Then visit http://localhost:8080/player.html in a browser.

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