Hi Cinaed,
Thank you for your response. Yes, I have tried those and the
"hw:CARD=Generic,DEV=0" works well for most flowgraphs. I obtained that
from the 'aplay -L' command.
Let me reiterate my request: In exploring the audio problems, I followed
the instructions in
https://wiki.gnuradio.org/index.php/ALSAPulseAudio#Monitoring_the_output_of_your_system
and it gave the error I cited. So what I want to know is: Did I do
something wrong, or is the procedure not correct?
I need someone who is familiar with the ALSA and PulseAudio software to
look at this.
Thanks.
--
Barry Duggan KV4FV
On Tue, 30 Jun 2020 00:22:02 -0700, Cinaed Simson wrote:
What does
aplay -l
indicate?
When using
hw:CARD=Generic,DEV=0
in gnuradio, try using numbers, for example,
hw:0,0
or
plughw:0,0
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>
main()
File "/home/barry/GRdev/Pluto_NFM.py", line 194, in main
tb.start()
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?
Thanks.
