[Webkit-unassigned] [Bug 249004] New: Audio bitrate drops after 5 minutes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249004

            Bug ID: 249004
           Summary: Audio bitrate drops after 5 minutes
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: teodor.atroshenko at gmail.com
                CC: youennf at gmail.com

Created attachment 463949

  --> https://bugs.webkit.org/attachment.cgi?id=463949&action=review

Audio bitrate graph

During multi-party WebRTC call (SFU), the issue was encountered when using RODECaster Pro Stereo microphone, opus/48000/2 codec, with minptime=10;useinbandfec=1 parameters. After around 5 minutes since the peer connection is established, the audio bitrate drops significantly and static noise is introduced. Packet count is consistent with no other issues (e.g., no video quality or data channel issues). Attached are screenshots of audio bitrate and packet count graphs, with bitrate drop happening around the time when the person resumes speaking after a pause in speech. This issue is consistently reproducible in Safari, yet does not happen in Chrome on the same device.

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