Picovoice with hifiberry DAC+ADC Pro Not working - python-3.x

Question

I am trying to run picovoice i.c.w. HiFiBerry DAC+ ADC Pro but I can't get it to work.
All works fine when I use an usb microphone though.
As an example I'm running cheetah_demo_mic.py
import argparse
from threading import Thread
from pvcheetah import *
from pvrecorder import PvRecorder
class Demo(Thread):
def __init__(
self,
access_key: str,
model_path: Optional[str],
library_path: Optional[str],
endpoint_duration_sec: float,
enable_automatic_punctuation: bool):
super(Demo, self).__init__()
self._access_key = access_key
self._model_path = model_path
self._library_path = library_path
self._endpoint_duration_sec = endpoint_duration_sec
self._enable_automatic_punctuation = enable_automatic_punctuation
self._is_recording = False
self._stop = False
def run(self):
self._is_recording = True
o = None
recorder = None
try:
o = create(
access_key=self._access_key,
library_path=self._library_path,
model_path=self._model_path,
endpoint_duration_sec=self._endpoint_duration_sec)
recorder = PvRecorder(device_index=-1, frame_length=o.frame_length)
recorder.start()
print('Cheetah version : %s' % o.version)
while True:
partial_transcript, is_endpoint = o.process(recorder.read())
print(partial_transcript, end='', flush=True)
if is_endpoint:
print(o.flush())
except KeyboardInterrupt:
pass
finally:
if recorder is not None:
recorder.stop()
if o is not None:
o.delete()
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--access_key', required=True)
parser.add_argument('--library_path', default=None)
parser.add_argument('--model_path', default=None)
parser.add_argument('--endpoint_duration_sec', type=float, default=1.)
parser.add_argument('--disable_automatic_punctuation', action='store_true')
args = parser.parse_args()
Demo(
access_key=args.access_key,
library_path=args.library_path,
model_path=args.model_path,
endpoint_duration_sec=args.endpoint_duration_sec,
enable_automatic_punctuation=not args.disable_automatic_punctuation).run()
if __name__ == '__main__':
main()
By default this script uses audio device -1 which is the default audio device.
When I run the script like it is above (audio device -1) I get the following warn every few seconds:
[WARN] Input device might be muted or volume level is set to 0.
When I run the script with audio device 0 (which should be the same device) the screen immediately fills with the following warn:
[WARN] Overflow - reader is not reading fast enough.
Output of arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplusadcpro], device 0: HiFiBerry DAC+ADC Pro HiFi multicodec-0 [HiFiBerry DAC+ADC Pro HiFi multicodec-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
amixer settings:
amixer -c 0 sset 'ADC Right Input' 'VINR1[SE]'
amixer -c 0 sset 'ADC Left Input' 'VINL1[SE]'
amixer -c 0 sset 'ADC Mic Bias' 'Mic Bias off'
amixer -c 0 sset 'ADC' 0.00dB
When I run:
arecord -d 10 -D hw:0,0 -f S16_LE -c 2 -r 48000 testfile.wav
it records without a problem, and the wav file contains the actual audio.
Please help!
There must be some sertting that can fix this.
Thanks!
Robert.