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

[bugzilla-daemon at webkit.org]

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

            Bug ID: 180748
           Summary: Audio sometimes fail to capture in WebRTC
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daginge at confrere.com
                CC: youennf at gmail.com

I'm seeing intermittent fails to capture/playback local audio requested through getUserMedia, both locally and when sent over a peer connection. This bug also shows up on WebRTC Samples. Oddly, this seems most often happens when I navigate to a new page, with subsequent refreshes working.

Steps to reproduce:
1. On an iPad, go to https://webrtc.github.io/samples/
2. Select sample "Audio-only getUserMedia() output to local audio element"
3. Make a pop sound and see if you can hear yourself.
4. If yes, close tab and open it again. Repeat 2-4 until you cannot hear yourself.

The above was tested on an iPad Pro MQDW2KN/A using iOS 11.2 (15C114). User agent reports AppleWebKit/604.4.7 Safari/604.1.

In the Developer Console, I see the success callback is triggered, and the stream object itself looks normal (muted = false). This is also true for the AudioTrack. However, no audio is playing. Other tests also fail, including AppRTC and our own solution. The "select camera and microphone" sometimes fails to show video as well, although I'm not sure if those are related.

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