[Webkit-unassigned] [Bug 236203] New: MediaRecorder produces unplayable video

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236203

            Bug ID: 236203
           Summary: MediaRecorder produces unplayable video
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: paconlin at microsoft.com
                CC: youennf at gmail.com

# Overview

Standard MediaRecorder capture of video element results in unplayable video on STP Release 139 (Safari 15.4, WebKit 17613.1.14.41.3)

## Steps to reproduce

1. Visit https://codesandbox.io/s/media-recorder-6tlzb
2. Click "Start camera"
3. Accept permissions for camera and microphone
4. Click "Start Recording"
5. Wait a few seconds
6. Click "Stop recording"
7. Click "Play"

## Actual Results
Resulting video is stuck on single frame

## Expected Results
Video should play back as expected

## Build Date & Hardware
STP Release 139 (Safari 15.4, WebKit 17613.1.14.41.3)
MacOS Version 12.2 (21D49)

## Additional information

* Sometimes the duration shows as 00:00:00 out of 1988:24:43 or something similar
* Works as expected on Version 15.3 (17612.4.9.1.5)
* If you download the video, it works in Quicktime. But if you try to drop the downloaded video back in the browser, it doesn't play.


Happy to provide any other details. Thanks!

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