[Webkit-unassigned] [Bug 262759] New: When recording audio, volume of recording diminishes after several seconds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262759

            Bug ID: 262759
           Summary: When recording audio, volume of recording diminishes
                    after several seconds
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bryce.a.aebi at gmail.com
                CC: cdumez at apple.com

I am recording audio in Safari from a Macbook pro microphone using the following basic code:


 const createStream = async () => {
    // For iOS Safari, reset to play-and-record to allow mic to work
    if ((isIOS || isSafari) && navigator.audioSession) {
      navigator.audioSession.type = "play-and-record";
    }

    const stream = await navigator.mediaDevices.getUserMedia({
      video: false,
      audio: true,
    });

    return stream;
  };

Without fail, the volume of the audio recording starts out at the expected level and then it diminishes in volume (maybe by more than 50%) after about 5 seconds. This happens both when I record and then play back the audio and also when I run an AnalyserNode on the audio in real time and view the audio data live.

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