Want to set sample rate from 48khz to 16khz.

[VijayDhake]

We are facing audio signal drop out issue in audio recording in chrome browser. But after using [extendable-media-recorder] that issue resolved. Thanks for it. But recorded audio is of 48khz but we want 16khz. Is there any way to set it. Please let me know. Thanks in advance.

[chrisguttandin]

Hi @VijayDhake,

there is no way to do this directly with a MediaRecorder. But it gets asked quite frequently and therefore I've added a section to the README which describes how it can be done with an AudioContext. I hope this helps.

[VijayDhake]

Hi @chrisguttandin,

As you suggest, I have tried the following code to resample the audio.

const audioContext = new AudioContext({ sampleRate: 16000 });
const mediaStreamAudioSourceNode = new MediaStreamAudioSourceNode(audioContext, { mediaStream: stream });
const mediaStreamAudioDestinationNode = new MediaStreamAudioDestinationNode(audioContext);

mediaStreamAudioSourceNode.connect(mediaStreamAudioDestinationNode);

const mediaRecorder = new MediaRecorder(mediaStreamAudioSourceNode.stream);

Above code is not working for me But If I change const mediaRecorder = new MediaRecorder(mediaStreamAudioSourceNode.stream); to const mediaRecorder = new MediaRecorder(mediaStreamAudioDestinationNode.stream, { mimeType: 'audio/wav' }); works fine for me. It is giving me a output 16khz, 16bit, 2 channel, But I require 16khz, 16bit, 1 channel. I have tried many ways to change it but it is not changing. There is any way to set channel. Please let me know. Thanks in advance.

[chrisguttandin]

Thanks for making me aware of the typo. I've fixed the readme. https://github.com/chrisguttandin/extendable-media-recorder/commit/66b9451cd14384dd66902c8f014f30928c954100

I have tried many ways to change it but it is not changing.

What exactly did you try and didn't work?

I think setting the channelCount of the MediaStreamAudioDestinationNode should work.

const mediaStreamAudioDestinationNode = new MediaStreamAudioDestinationNode(
    audioContext,
    {
        channelCount: 1
    }
);

[VijayDhake]

        let stream = await navigator.mediaDevices.getUserMedia({ audio: true });

            gumStream = stream;

          const audioContext = new 
![console](https://user-images.githubusercontent.com/67089587/224911604-ae2c786e-9ef2-42f5-b318-d7ef5d5520cd.png)
AudioContext({ sampleRate: 16000 });    
          const mediaStreamAudioSourceNode = new MediaStreamAudioSourceNode(audioContext, { mediaStream: stream });
          //console.log("mediaStreamAudioSourceNode", mediaStreamAudioSourceNode)

          const mediaStreamAudioDestinationNode = new MediaStreamAudioDestinationNode(audioContext);
          //console.log("mediaStreamAudioDestinationNode", mediaStreamAudioDestinationNode)

          mediaStreamAudioSourceNode.connect(mediaStreamAudioDestinationNode);

          recorder = new MediaRecorder(mediaStreamAudioDestinationNode.stream, { mimeType: 'audio/wav', channelCount: 1 });
          recorder.start();

Have already added and tried above solution. But Still output showing 2 channel. Attached screenshot of output.

[chrisguttandin]

Could you please try again with the latest version. I hope the fix for #655 fixed this as well.