Echo and noise in sound webRTC android

Question

I am working on webRTC i am doing live stream between two android devices on local network it is working pretty fine for me except the sound quality issue there is noise and echo in sound. If i use hands-free on one end it gets better but i don't want to use hands-free.

So how can i improve the sound quality, what techniques are there to improve the sound quality. It also said the webRTC has echo cancellation functionality built in if it's than why echo is still there.

Alexey Osminin · Answer 1 · 2023-01-26T22:13:13.523

6

You can try to add special audio constraints when you are creating audio source. It should look like:

MediaConstraints audioConstraints = new MediaConstraints();
audioConstarints.mandatory.add(new MediaConstraints.KeyValuePair("googNoiseSuppression", "true"));
audioConstarints.mandatory.add(new MediaConstraints.KeyValuePair("googEchoCancellation", "true"));

There are a lot of media constraints related to audio features and I suggest to try different combinations of them, full list can be found here https://chromium.googlesource.com/external/webrtc/+/branch-heads/57/webrtc/api/mediaconstraintsinterface.cc

edited Jan 26 '23 at 22:13

answered Jul 14 '15 at 12:58

Alexey Osminin

190
1
4
14

Can I do the same in iOS?? – Chanchal Chauhan Jan 28 '21 at 12:35
it's a common part of webrtc, so it should be possible to do on iOS too – Alexey Osminin Feb 01 '21 at 07:46
These keys are not mentioned in iOS and if I enter the same keys, it doesn't work. – Chanchal Chauhan Feb 01 '21 at 08:53

score 2 · Answer 2 · answered Mar 26 '15 at 03:37

2

What's happening is that you are playing your own local audio back to yourself. This creates a feedback loop between your microphone and speakers. That's why it kinda sounds better when you have the hands-free device. You can remove the local audio by modifying the stream of getUserMedia():

var constraints = {video: true, audio: true};
getUserMedia(constraints, function(stream){
    var videoOnly = new MediaStream(stream.getVideoTracks());
}, errorHandler);

answered Mar 26 '15 at 03:37

Tony Rizko

315
2
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Actually i am coding on android so how can i do that on android end? – umerk44 Mar 26 '15 at 07:58
@umerk44 can you edit your question to include some of the code that you wrote to get a User's video and audio stream? – Tony Rizko Mar 26 '15 at 08:28

score 1 · Answer 3 · edited Nov 04 '20 at 14:42

1

I guess you are experiencing the Larsen effect, the 2 audio outputs being replayed by both microphones, creating endless audio loops. There is not much you can do against this if both devices are in the same room, but indeed browsers have echo cancellation options you can activate this way (not sure they are by default):

if (window.chrome) {
    audioConstraints = {
        mandatory: {
            echoCancellation: true
        }
    }
} else {
    audioConstraints = {
        echoCancellation: true
    }
}
var constraints = {video: videoConstraints, audio: audioConstraints};
navigator.getUserMedia(constraints, userMediaSuccess, userMediaError);

Also, mute the local video, users obviously don't need it.

edited Nov 04 '20 at 14:42

Manaus

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answered Mar 25 '15 at 19:22

peveuve

770
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20

I spent all evening on this side effect. Then, how can I check if echo cancellation is effectively being working? – Rubén Viguera May 15 '19 at 16:13
How to mute the local video ? – zeus Jul 08 '19 at 20:43

Echo and noise in sound webRTC android

3 Answers3

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