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mixer_text_bulk_write=false
mixer_text_bulk_write_with_buffer=false

7. When a number of participants are speaking simultaneously, some participants are less audible then others. The problem is typical for mixing WebRTC streams, and may ocuur in any solutions using WebRTC and audio mixing, in Discord for example: more data are encoded to one stream, more audio samples may be dropped due to fixed samplerate.

Symptoms: when three or more participants are speaking simultaneously, one of them is less audible then two others

Solution:  raise the audio publishing bitrate on client to send more data per one participant

constraints: {
  audio: {
     bitrate: 128000
  }
}

and raise Opus encoding bitrate on server

opus.encoder.bitrate=128000