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frequently-asked-questions.md 4.23 KiB

Frequently Asked Questions

Which Audio Interface / Soundcard is compatible with Aura?

Basically any audio device which is supported by Linux Debian/Ubuntu and has ALSA drivers. Engine has been tested with following audio interfaces:

  • ASUS Xonar DGX,
  • Roland Duo-Capture Ex
  • Onboard Soundcard (HDA Intel ALC262)
  • Native Instruments Komplete Audio 6

ALSA Settings

In the Liquidsoap Logs I get 'Error when starting output output_lineout_0: Failure("Error while setting open_pcm: Device or resource busy")!'. What does it mean?

You probably have set a wrong or occupied device ID.

How can I find the audio device IDs, required for settings in engine.ini?

  • ALSA: You can get the device numbers or IDs by executing:

    cat /proc/asound/cards

  • Pulse Audio: You might not need this for Pulse Audio, but still, to see all available devices use:

    pactl list

If you cannot find correct ALSA settings
Well, this is - at least for me - a hard one. I could not manage to find correct ALSA settings for the above mentioned soundcards. The best experience i had with the ASUS Xonar DGX, but still very problematic (especially the first couple of minutes after starting liquidsoap). Since i enabled JACK support i only use that. It is also a bit of trial and error, but works pretty much out of the box.

If you experience 'hangs' or other artefacts on the output signal

  • Reduce the quality (especially, when hangs are on the stream) or

  • Check the logs (especially the Liquidsoap logs) for any configuration issues

  • Check ther performance of your computer or audio hardware

  • Install the realtime kernel with

    apt install linux-image-rt-amd64
reboot

I have issues with starting the Engine

Cannot connect to socketpath /opt/aura/engine/src/liquidsoap/engine.sock. Reason: [Errno 111] Connection refused

  • This indicates some issue with the proper startup of Liquidsoap or any related audio device. Check the Liquidsoap logs for details.

[clock.wallclock_alsa:2] Error when starting output lineout: Failure("Error while setting open_pcm: No such file or directory")!

  • This might indicate some issue with your ALSA device. Check if aplay -l and aplay -L returns some valid device(s). You can also try alsamixer.
  • It might be also helpful to set your default audio device in /etc/asound.conf.
  • Also check if your user (è.g. engineuser) belongs to the group audio.
  • Check the audio interface configuration section in engine.ini. Verify if the default settings input_device_0="hw:0" and output_device_0="hw:0" are valid device IDs.

I have issues during some Engine play-out

Some stuttering sound is hearable. The logs say "strange error flushing buffer ..."

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