usr/bin/omxplayer
try:
/usr/bin/omxplayer
instead.
What happens if you put in the name of a file that does not exist for the song file?
Also what do you see on output 1?
Click to see if file not exist (Code:1)
EDIT: I created test.sh with cmdline and tried to execute it with an exec node... same error (Code 255) .... hmmpf
And on output 1?
Error: not redy yet
This is the hint I think.
filename = "/home/pi/Desktop/lassedenken.mp3"
return {filename:filename,payload:"open"}
and next send the payload:
{payload:"playpause"}
thx ... result is: "The name org.mpris.MediaPlayer2.omxplayer was not provided by any .service files"
leads me to this: Error using debus for muting and unmuting ¡ Issue #492 ¡ popcornmix/omxplayer ¡ GitHub
Then i'm lost 
I suspect that the omxplayer on commandline/exec node requires access to /dev and node-red does not have the privileges.
You still haven't told us what you see on output 1 when you use the exec node.
bash / console output: File "/home/pi/songs/blabla.mp3" not found.
node red output:
object
code: 255
message: string
Command failed: /home/pi/Downloads/test.sh
I meant for the good file. Connect a debug node to output 1 and show us what you see.
Edit That is for the direct call to omxplayer, not the script.
A quick google search for the error message you are getting failed to open vchiq instance finds this stack overflow question about running omxplayer on a Pi from Php code - https://stackoverflow.com/questions/42583835/failed-to-open-vchiq-instance
Check the answers for the solution.
Thx ! This is the solution for "exec node not working" and for "rpi-omxplayer does not play sounds":
sudo chmod 777 /dev/vchiq
Much thanx to all that quick and exelent help to all you guys who answered !!!
@knolleary @Colin @bakman2 @ukmoose @afelix (no special order)
See ya in my next thread
