Hi, "aplay somefile.wav" with or without -D default works fine om my raspberry to play audio to paired bluetooth speaker. The same command from within exec node gives error: "aplay: main830: audio open error: unknown error 524" Other commands issued using exec node work fine. I controll the moving parts of my christmas village this way but no music ... What is going wrong? Thanks in advance 6akaeddy2

A combination of the suggestions of PdJ and Colin seems to work. after rebooting the pizero i now issue "node-red-stop" and "node-red &". then "bluetoothctl power on" and "bluetoothctl connect mac-addres-speaker". Then the exec node "aplay -D pulse somevfile.wav" works. Okay for now. Would like a solution whitout manualy restarting node-red in the future. probably start node red not as a service but from login script of user?

This got me audio out of the headphone socket - something similar might work for Bluetooth [image] [SOLVED]Not hearing sound using aplay via exec when running as service General Following on from how to get Node-RED to run as a service on a Pi I'm having trouble playing a sound via exec node So I'm trying to play a wav file out thru the Pi audio jack It works fine when I run Node-RED directly from a terminal As I was typing this I suddenly thought that the sound is probably defaulting to going out thru HDMI and with a bit of googling and experimenting I came up with this as my solution [image] which tells it to explicitly use the audio jack and all good …

Thanks Cymplecy, I looked at your suggestion. Aplay should play via bluetooth. It does when invoked in a terminal session so I think this is the default now. Using "aplay -D default file.wav" using node red exec however gives the error. Tried other options then "default". "-D pulse" works from terminal. From nore red exec it gives an other error: ALSA lib pulse.c:242:(pulse_connect) PulseAudio: Unable to connect: Connection refused aplay: main:830: audio open error: Connection refused using "paplay file.wav" from exec node results in "Connection failure: Connection refused pa_context_connect() failed: Connection refused" I'm out of idees

How are you running node-red? If running it as a service try stopping it (node-red-stop) and run it directly in the terminal using node-red If it plays now then possibly the node-red user is not in the audio group.

Hi Colin, I start node red as a service, but i have to login opening the web interface. Node red exec node "whoami" returns my username, so i think (p)aplay is called as me? Yede

Have you tried what I suggested?

Hi Colin, I thought i did without result, now for second time is does work. I see no user node-red in /etc/passwd? how to add it to group audio then? added myself to pulse and pulse-access. don't know is that was smart... What is my next step? Thanks so far!

Look in the systemd service to see what is the user running the service cat /lib/systemd/system/nodered.service There should be lines near the start setting the User and Group.

[service] Type=simple #Run as normal pi user - change to the username you wish to ron NodepRED as User=yede Group=yede WorkingDirectory=/home/yede yede is my username. instead of standard user pi

So is that the same user that you were logged in as when you ran node-red. If so then it is not the group, it must be something to do with the environment when logged in via ssh versus the service running.

yes, same user as logged in via ssh (headless pi zero 1) and started node-red manualy

Node-RED

Node-RED Forum

Problem playing audio file from node red

General

cymplecy 11 December 2023 10:16 2

This got me audio out of the headphone socket - something similar might work for Bluetooth

Topic		Replies	Views
Node-Red v3.1.0 Exec node now causing an Error General	27	704	17 September 2023
No sound from exec play audio command General	5	582	1 December 2022
Audio problems using exec node General	40	789	19 April 2023
More audio problems using exec node General node-red-dashboard	11	411	6 January 2024
Playing audio files on remote machine and use their speakers - not the hosts' General	33	1256	24 November 2023

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Problem playing audio file from node red

Related topics