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PostPosted: Fri Dec 06, 2019 8:57 pm 

Joined: Sat Nov 16, 2019 5:11 pm
Posts: 1

I am hoping someone can help. I am trying to get Stereo Tool 9.37 to work on a Raspberry Pi 3b (Raspbian) using a Hifiberry DAC and a VLC audio stream. I have downloaded jackd and the jack version of Stereo Tool. I start jackd using jackd -d alsa -p 4096 -n within terminal, I then start Stereo Tool (32Bit version as 64Bit doesn't launch. Also from making an executable using chmod +x) and see an error "Input: Error opening: Invalid number of channels"

It is from here I am stuck, I gather I need to change the audio output of VLC but to what, I do not know. I do not see an option for either jack or stereo tool.

I would be grateful if anyone can help, I find Raspbian / Linux so difficult!

Thank you

PostPosted: Mon Dec 09, 2019 10:52 pm 

Joined: Thu Jan 15, 2015 11:19 am
Posts: 68
Some hints:
stereotool wants to connect inputs at the start, but on the pi there are none with default setting, so stereotool complains.

The easiest is to satisfy stereotool by using the dummy backend for jack: jackd -d dummy -p 4096
Then you need to find out the name of your DAC: aplay -l and aplay -L
Using alsa_out, you can then get the audio from jack to your DAC.

The downside of this is additional sample rate conversion, which comes at a cost.

You can then switch back to using jack directly on ALSA and use some sort of metering tools to provide ST with the needed inputs. Note tha VLC does only provide outputs during playback.

Oh, and get a Pi4. Pi3 doesn't have enough power to run high quality settings.

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