Running multiple instances of OP25

[boatbod]

well aplay -D plughw:0,0 file.wave plays but not plughw:1,0 which is what aplay -l shows the usb.

ls /proc/asound/card0 shows
codec#0 id pcm0c pcm0p

ls /proc/asound/card1 shows
id pcm0p stream0 usbbus usbid usbmixer

card1 pcm0p should be a playback port (hence the 'p' rather than 'c', which would be capture).
Are you receiving permission denied, or is it simply not working?
If permission denied, it's likely because something else is holding the port open. There would likely be ways around that using 'dmix' if that is the case.

 

[mrwright8t8]

aplay -D plughw:1,0 file.wave
shows its playing the wave file but no sound

 

[mrwright8t8]

i can switch auto out to usb in pulseaudio and they work

 

[mrwright8t8]

volume was down in alsamixer.alsa and pulse volume controls seem to be conficting

 

[boatbod]

volume was down in alsamixer.alsa and pulse volume controls seem to be conficting

Can't say I'm surprised. Linux audio is a messy business.

 

[boatbod]

im doing alittle testing before my sound card #2arrives and im getting
segmentation fault ( core dumped)
I've uploaded the stderr.2,

I have tracked down and fixed the cause of this elusive PulseAudio core dump. Simple python ctypes change in sockaudio.py

 

[mrwright8t8]

nice. pulseaudio is only giving from 95 to 100% on the usb audio volume were 95 is 0 in alsa and 100 is 100.im ok with using alsa to control the volume.

 

[boatbod]

nice. pulseaudio is only giving from 95 to 100% on the usb audio volume were 95 is 0 in alsa and 100 is 100.im ok with using alsa to control the volume.

Have you installed the "pavucontrol" utility?

sudo apt-get install pavucontrol

 

[mrwright8t8]

yes.is what it is 😆
now im trying to get the usb speaker to work on the pib3+.it works for 30 sec.stderr says pcm underrun audio closing
oh and on the pi im using rx.py with -O plughw:1,0

 

[boatbod]

yes.is what it is 😆
now im trying to get the usb speaker to work on the pib3+.it works for 30 sec.stderr says pcm underrun audio closing
oh and on the pi im using rx.py with -O plughw:1,0

Turn off any gnuplots and minimize the sample size (-S 1000000) to lower the cpu utilization.
Good luck!

 

[mrwright8t8]

doesn't look like i have any luck keep getting

audio device: default
set_buffer_size_near requested 4000, but returned 2730
Listening on 127.0.0.1:23456
python version detected: 2.7.16 (default, Oct 10 2019, 22:02:15)
[GCC 8.3.0]
Allocating 15 zero-copy buffers
01/23/21 16:26:04.718313 control channel timeout
01/23/21 16:26:05.791437 voice update: tg(2000), freq(856237500), slot(-), prio(1)
01/23/21 16:26:07.856964 PCM underrun

sound stops after but op25 is still running

 

[boatbod]

doesn't look like i have any luck keep getting

audio device: default
set_buffer_size_near requested 4000, but returned 2730
Listening on 127.0.0.1:23456
python version detected: 2.7.16 (default, Oct 10 2019, 22:02:15)
[GCC 8.3.0]
Allocating 15 zero-copy buffers
01/23/21 16:26:04.718313 control channel timeout
01/23/21 16:26:05.791437 voice update: tg(2000), freq(856237500), slot(-), prio(1)
01/23/21 16:26:07.856964 PCM underrun

sound stops after but op25 is still running

"set_buffer_size_near" is an ALSA error. Try increasing the memory available to the driver.

sudo su -
echo 1024 > /proc/asound/card0/pcm0p/sub0/prealloc

You may need to change the values of card and pcm to match which device you are actually using.

 

[mrwright8t8]

-sudo su
echo 1024 > /proc/asound/card0/pcm0p/sub0/prealloc
permission denied
then i try
-
echo 1024 > /proc/asound/card1/pcm0p/sub0/prealloc
no such file or directory

 

[boatbod]

-sudo su
echo 1024 > /proc/asound/card0/pcm0p/sub0/prealloc
permission denied

You need to be root to perform the echo command in the manner shown.
The command "sudo su -" should take you to the root prompt '#' at which point the echo should work. You can cat the prealloc file to see if the change was successful or not. Unfortunately it is not possible to simply edit the file with nano (or vi) because it's a special kernel parameter and not a real file.

 

[mrwright8t8]

-sudo su
echo 1024 > /proc/asound/card0/pcm0p/sub0/prealloc
permission denied

i did use sudo su.
i guess something is wrong with raspbian buster lite.good part about it being a pi, just wide sd and do a fresh install of raspbian full
see if that fixes.

 

[sallen07]

i did use sudo su.

Was that a typo in your post, or did you type "-sudo su"? It needs to be "sudo su -".

 

[mrwright8t8]

yes that was a typo.
after a fresh install i am no longer getting pcm underrun, i get a second of audio then it stops.im just going to use the headphone jack until i figure it out. the pi was going to be my mobile unit just plug power in.
my mini laptop with 2 dongles has just made my $350 uniden useless.

 

[boatbod]

my mini laptop with 2 dongles has just made my $350 uniden useless.

Um yeah, but your laptop probably cost more than your Uniden.

 

[mrwright8t8]

Um yeah, but your laptop probably cost more than your Uniden.

lol well maybe but its a old hp mini obtained free from Verizon like 10 years ago for bundling i think it has 1gb ram in it lol, its only purpose now is op25