Error reading audio with python on Ubuntu 14.04

Question

When running the following code using python 2.7 (in Ubuntu 14.04)

import pyaudio
p = pyaudio.PyAudio()

I get the following exception:

ALSA lib pcm_dsnoop.c:618:(snd_pcm_dsnoop_open) unable to open slave

ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave

ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe

ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side

bt_audio_service_open: connect() failed: Connection refused (111)

bt_audio_service_open: connect() failed: Connection refused (111)

bt_audio_service_open: connect() failed: Connection refused (111)

bt_audio_service_open: connect() failed: Connection refused (111)

ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave

Cannot connect to server socket err = No such file or directory

Cannot connect to server request channel jack server is not running or cannot be started

Your help would be highly appreciated

Same error in ubuntu 20.04 python3.6

Chris P
– Chris P

2020-06-02 23:49:33 +00:00
Commented Jun 2, 2020 at 23:49 — Chris P
– Chris P, Commented Jun 2, 2020 at 23:49

James Jeffery · Accepted Answer · 2015-10-08 13:55:27Z

2

Do you have bluez-alsa package installed? If so remove it, and re-test. Should get rid of the errors.

If not there is also some discussion here (https://github.com/Katee/quietnet/issues/18) that might be helpful.

ALSA lib pcm.c:7843:(snd_pcm_recover) underrun occurred

The underun is likely caused because pulseaudio is already accessing 
the card - you can pause it using http://linux.die.net/man/1
/pasuspender. In general to avoid such deadlock, you need a 
soundserver like jackd https://help.ubuntu.com/community/What%20is%20JACK, but you already figured this out from the following log
entries in your trace ;-) (apt-get install jackd)

answered Oct 8, 2015 at 13:55

James Jeffery

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1 Comment

Alex L Over a year ago

I removed bluez-alsa and the "bt_audio_service_open" errors were removed, but the recording still does not work

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