Hi every time i execute pyauido.PyAudio() i get the following error. I try to display the audio recorded by my mic using these instructions: https://swharden.com/wp/2016-07-19-realtime-audio-visualization-in-python/ and use my USB-Mic and the headphone-jack of my raspberry pi 3+
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPer iodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPer iodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2565:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPer iodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
Update: As mentioned in the comments i got rid of the "Unknown PCM" by editing the alsa.conf file, but i realised that the traceback was not added to the snippet i posted here so here is the "new, complete"-Message:
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
ALSA lib pcm_dsnoop.c:638:(snd_pcm_dsnoop_open) unable to open slave
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave
Expression 'alsa_snd_pcm_hw_params_set_period_size_near( pcm, hwParams, &alsaPeriodFrames, &dir )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 924
Traceback (most recent call last):
File "sound.py", line 9, in <module>
frames_per_buffer=CHUNK)
File "/usr/lib/python2.7/dist-packages/pyaudio.py", line 750, in open
stream = Stream(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pyaudio.py", line 441, in __init__
self._stream = pa.open(**arguments)
IOError: [Errno -9996] Invalid input device (no default output device)
Additional information:
**** List of CAPTURE Hardware Devices ****
card 2: Device [USB PnP Audio Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
[12:06:02] openhabian@openhab:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
.asoundrc - configuration:
pcm.!default {
type asym
capture.pcm "hw:2,0"
playback.pcm "hw:1,0"
}
