[Webkit-unassigned] [Bug 180748] Audio sometimes fail to capture in WebRTC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180748

--- Comment #28 from daginge at confrere.com ---
Created attachment 370059

  --> https://bugs.webkit.org/attachment.cgi?id=370059&action=review

Log of failed audio capture in desktop Safari 12.1

We're seeing this bug again in Safari 12.1. Refresh solved the issue with no other changes being made.

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15

To observe the issue in the log file, do the following steps:
1. Open https://fippo.github.io/webrtc-dump-importer/rtcstats
2. Open the file attached to this comment
3. Observe microphone used is "MacBook Air microfoon"
4. Scroll down to RTCOutboundRTPAudioStream
5. Uncheck "ssrc"
6. Observe that "bytesSent" is 0 through the call.

Seconds after the user refreshes, accepts media, restarts the call and it works no problem (this is another, much bigger, log file and is not included. Let me know if you want it). Note that video worked and was transmitted successfully in both these cases.

We'll be creating some telemetry on this to find the scope of this problem, but we're seeing increased reports of audio issues since the release of Safari 12.1.

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