[Webkit-unassigned] [Bug 249250] New: REGRESSION: iOS 16/Safari 16 Media Recorder API throwing errors

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249250

            Bug ID: 249250
           Summary: REGRESSION: iOS 16/Safari 16 Media Recorder API
                    throwing errors
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joma at twilio.com
                CC: cdumez at apple.com

Created attachment 464028

  --> https://bugs.webkit.org/attachment.cgi?id=464028&action=review

Error from example application

Currently, the Media Recorder API is no longer working on iOS 16 devices. However, testing on iOS 15 devices prove this feature to be functional. 

Reproducibility: 100%

Devices used: 
1. iPhone 11 Pro + iOS 16.1 reproducible
2. iPhone 11 Pro + iOS 15.5

Steps to reproduce:
Using the MediaStream Recording API Documentation: https://developer.mozilla.org/en-US/docs/Web/API/MediaStream_Recording_API/Using_the_MediaStream_Recording_API

1. Using the application provided by MDN: https://mdn.github.io/dom-examples/media/web-dictaphone/
2. Open application on iOS 16 device
3. Click Record, record for some time
4. Click Stop, save sound clip
5. Click play on the sound clip

Expected result:
The application should play back the recorded audio.

Actual Result:
The application throws an error.

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