How to record audio with mono MP3 output format

[kamshory]

Here is my code:

_this.recorder = new WebAudioRecorder(_this.input, {
				workerDir: "js/", // must end with slash
				encoding: _this.encodingType,
				numChannels:2, //2 is the default, mp3 encoding supports only 2
				onEncoderLoading: function(recorder, encoding) {
				},
				onEncoderLoaded: function(recorder, encoding) {
				}
			});

I want to save mono MP3s to save storage space and speed up data transfer.

[andreszs]

It seems your best option in this case is to lower the bitRate to 64, because numChannels must always be 2 for some encoder-related reason.