What does

  aplay -l


When using


in gnuradio, try using numbers, for example,




and see if it makes a difference.

Or try switching between sampling rates of 48000 and 44100.

-- CInaed

On 6/29/20 3:00 PM, Barry Duggan wrote:
I have been having problems with audio underruns on some of my flowgraphs, so I decided to try the procedure in https://wiki.gnuradio.org/index.php/ALSAPulseAudio#Solution_2

I found one entry (other than HDMI) for my speakers and created the following for ~/.asoundrc :
pcm.pulse_monitor {
    type pulse
    device alsa_output.pci-0000_0f_00.4.analog-stereo.monitor

ctl.pulse_monitor {
    type pulse
    device alsa_output.pci-0000_0f_00.4.analog-stereo.monitor

I changed my Audio Sink device name to 'pulse_monitor' and got the following error: ALSA lib pcm_pulse.c:752:(pulse_prepare) PulseAudio: Unable to create stream: No such entity

gr::log :ERROR: audio_alsa_sink0 - [pulse_monitor]: snd_pcm_hw_params failed: Input/output error
Traceback (most recent call last):
  File "/home/barry/GRdev/Pluto_NFM.py", line 216, in <module>
  File "/home/barry/GRdev/Pluto_NFM.py", line 194, in main
  File "/usr/local/lib/python3/dist-packages/gnuradio/gr/top_block.py", line 111, in start
    top_block_start_unlocked(self._impl, max_noutput_items)
  File "/usr/local/lib/python3/dist-packages/gnuradio/gr/runtime_swig.py", line 5828, in top_block_start_unlocked
    return _runtime_swig.top_block_start_unlocked(r, max_noutput_items)
RuntimeError: check topology failed on audio_alsa_sink(9) using ninputs=1, noutputs=0

Using the device name "hw:CARD=Generic,DEV=0" works, but gives the underruns. I'm using Ubuntu 19.10.

Any ideas?

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