Trouble google assistant demo on a raspberry pi 3 and MATRIX Creator mic array

Question

I am getting the following error when I run google-assistant-demo, but arecord works fine with ALSA capture file type:

error:

(env)pi:~$ google-assistant-demo 
ALSA lib pcm.c:7918:(snd_pcm_set_params) Sample format not available for CAPTURE: Invalid argument
[3329:3347:ERROR:audio_input_processor.cc(755)] Input error
ON_MUTED_CHANGED:
  {u'is_muted': False}
ON_START_FINISHED
ON_ASSISTANT_ERROR:
  {u'is_fatal': True}
[3329:3348:ERROR:audio_input_processor.cc(755)] Input error
ON_ASSISTANT_ERROR:
  {u'is_fatal': True}

asoundrc config:

pcm.!default
{
  type asym
  playback.pcm {
    type hw
    card 0
    device 0
  }
  capture.pcm {
    type file
    file "/tmp/matrix_micarray_channel_8"
    infile "/tmp/matrix_micarray_channel_8"
    format "raw"
    slave {
        pcm dummy
    }
  }
}

The next lines works fine:

arecord --format=S16_LE --duration=5 --rate=16k --file-type=raw out.raw
aplay --format=S16_LE --rate=16k out.raw

Answer 1

Copy asoundrc to root as well. Worked in my case. Good luck.