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I'm currently working on webrtc project, and having a problem with audio echo when not using an earphone, or external mic, is there any work around or fix for this

Ihsan
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  • WebRTC is a P2P data transfer protocol and has nothing in common with audio. – polkovnikov.ph May 23 '16 at 12:08
  • @polkovnikov.ph you're thinking of RTCPeerConnection. For historical reasons, WebRTC is often used as an umbrella term for both that and the `getUserMedia` API. Even peer connections aren't data-agnostic, and deal specifically with audio and video. – jib May 23 '16 at 14:13

3 Answers3

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Echo cancellation is supposed to be on by default in WebRTC. You can turn it off to hear the difference:

navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: false } })
  .then(stream => audio.srcObject = stream)
  .catch(e => log(e));

var log = msg => div.innerHTML += msg + "<br>";
<audio id="audio" controls autoplay></audio><br>
<div id="div"></div>
<script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>

Echo cancellation technology can exist at many levels - software in the browser, in the OS, and sometimes even in your hardware mic - sometimes these technologies can interfere with each other.

Not knowing your system, I would recommend checking out your system's sounds settings to make sure you don't have helpful processing happening at too many levels.

For example, on OSX, there's a use ambient noise reduction feature under Sound Settings that unintuitively works better for me with WebRTC when I turn off. You only want one chef attempting echo cancellation at the same time.

If you are working on a web site for other clients, then there's not much you can do in software, and I would expect most systems to work, if not perfectly, decently well, though a headset will always be better.

jib
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  • yes i have no problem if i use a headset, but the echo still exist if i didn't use it because my voice returned from other people speaker and that cause echo or feedback, have any other solution for this ?. – Ihsan May 23 '16 at 14:50
  • @ShinjiKagehisa what browser, system and microphone? – jib May 23 '16 at 18:12
  • chrome, firefox using osx, windows, linux and builtin microphone – Ihsan May 24 '16 at 02:23
  • @ShinjiKagehisa actually, if you're hearing your voice returned from other people's speakers then maybe the echo is on *their* system. I would try different participants to isolate where the echo is coming from (I know you mentioned headphones fixing it which is what's confusing). – jib May 24 '16 at 14:23
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Currently there's no best solution for echo cancelation in webrtc, so the best solution i found is using AEC software, or built in echo cancelation software

Ihsan
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I had the same trouble even with the video echoCancellation constraint

I could finally delete the echo/noise adding the property muted="true" to your local video element and set up the volume to 0 document.getElementById("localVideo").volume = 0

That will not prevent your localStream to have the sound but it'll cancel the noise you have locally.

Adrian García
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