Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375

[maximilianmikus]

Hi, I am getting this error. My processAudio function is empty and only returns the inputBuffer.

ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
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)
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
input :15
output :15
rate :44100
format :1
size :4
inputChannels :1
outputChannels :2
interleaved :0
uses input: 1
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375
Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375

The line

Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4375

is repeated infinetly and i can hear strange ticks from my speakers.

I had to fix portaudio (https://github.com/ZECTBynmo/node-core-audio/issues/33).

[ZECTBynmo]

This looks related http://ubuntuforums.org/showthread.php?t=1490237

[Vuurbaard]

I am having exactly the same issue on my raspberry pi, did you manage to find a solution yet?

However I don't seem to have bluetooth devices, this is what I get:

Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4307 Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4307 Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4307 Expression 'stream->capture.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4307 Expression 'savail' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4463 Expression 'err = GetStreamWriteAvailable( stream )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4406 Expression 'savail' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4463 Expression 'err = GetStreamWriteAvailable( stream )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4406

[Vuurbaard]

Seems to be that when you add { useMicrophone: false } to the options it gets rid of that Expression 'stream->capture.pcm' failed error line. My goal is not to capture from the microphone anyway. Might have something to do with installing jackd1 instead of jackd2 as I read that jackd2 isn't really stable on a raspberry pi? Don't quote me on that, though.

However it still leaves me with that strange ticking noise and this error:

Expression 'savail' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4463 Expression 'err = GetStreamWriteAvailable( stream )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4406

[maximilianmikus]

I am using ubuntu with a desktop pc, so I doubt it is related to raspberry pi.

after setting { useMicrophone: false } I dont get any error output, but I still get the strange ticking noise.

in the aforementioned thread it was suggested to remove the "bluez-alsa" package, but that did not help me with this issue.

[nhtranngoc]

I'm running into the same problem as @maximilianmikus on Fedora 25:

• Tried @guicontat's fix on #33
• Tried setting {useMicrophone: false}
• I don't have bluez-alsa installed