[Webkit-unassigned] [Bug 212275] New: MediaRecorder requestData() always returns empty Blob

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212275

            Bug ID: 212275
           Summary: MediaRecorder requestData() always returns empty Blob
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: majo at squadcast.fm

I'm working on this bug https://bugs.webkit.org/show_bug.cgi?id=202233 and I wanted to use requestData() but found that in Safari or the MiniBrowser, requestData() always return an empty Blob.

I have try it in Chrome and Firefox and it worked as expected.

To replicate...

 1. Open Safari
 2. Open the Develop Menu
 3. Hover over the Experimental Features list item
 4. Click on MediaRecorder to Enable it
 5. Navigate to https://codepen.io/majov5/pen/LYpaEga
 6. Click on the blue Start Test button at the bottom
 7. Allow access to Microphone & Camera
 8. Click on the Record button at the bottom


Now every 5 seconds the Codepen console will print

[object Blob] {
   size: 0,
   slice: function slice() {...},
   type: ""
}

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