Testing Output

I am using ffmpeg to test the functionality:

In order to prevent the following error: /tmp/snapfifo: Permission denied, I executed the following command

sudo sysctl fs.protected_fifos=0

And then I can start to play audio e.g. from a url with

ffmpeg -i http://stream.srg-ssr.ch/m/rsj/mp3_128 -f s16le -c:a pcm_s16le  /tmp/snapfifo