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

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jan 23 20:10:21 PST 2018


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

valbeattie at yahoo.com changed:

           What    |Removed                     |Added
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                 CC|                            |valbeattie at yahoo.com

--- Comment #8 from valbeattie at yahoo.com ---
I am also seeing this issue of the unreliability of getUserMedia requests for audio. I cannot submit a reproducible scenario because it is not reproducible.  

But similar to the comments above, the behavior is the following, and it happens for me (specs below) more than 50% of the time:

- the getUserMedia call appears to succeed, but no audio from the mic flows (in fact, zeroes are returned)

- if you retry the getUserMedia call after it has failed as above (while on the page), you can retry as many times as you like, and it will never succeed.    

I see this behavior on an iPad Air, on 11.2.5 b7.  I have observed it both in our own webapp which does recording, and on the following demo site:

https://www.webrtc-experiment.com/RecordRTC/simple-demos/audio-recording.html

My testing does not involve interruptions from other apps or switching between tabs, I see this behavior when just trying to record in a single page with nothing else competing for the microphone.  I guess that makes me unsure that it is indeed related to https://bugs.webkit.org/show_bug.cgi?id=179964 as in the previous comment, but maybe. There are of course multiple (at least 2 anyway) calls to getUserMedia involved - one to obtain the mic permissions, and another to record.

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