Use mp3 as input

[MontyZuma]

Hi!
I'm trying to test the Audio trigger functionality. Since I have no audio input at the moment I would like to use an mp3 recording as input.

Is there any way to do that?

klaus

[janosvitok]

Depends on the OS you use.

Linux: check out alsa loopback device. Start player with output to loopback, set QLC+ to use alsa loopback as input.
OSX: I assume Core Audio has similar facility
Windows: It may be possible to instruct QLC+ to use the overall mix as input. In that case, you need to start normal player.

[MontyZuma]

I'm posting in Linux specific - it's safe to assume I'm on Linux.

But I very much appreciate this full answer - I'll get some info about alsa loopback devices. I might report back my experiences.

klaus

[janosvitok]

Sorry, I didn't notice the forum

[MontyZuma]

Solution for Ubuntu/PulseAudio:

1. Install pavucontrol

   Code: Select all

   sudo apt install pavucontrol

2. Open a shell and load the PulseAudio loopback module:

   Code: Select all

   pactl load-module module-loopback

3. Start qlc+ and use audio standard input, add an audio control and start up the whole stuff
4. Start audio playback
5. Start pavucontrol and in the Record Tab find ALSA Plug-In qlcplus and select Monitor of internal Audio
   Beware: qlc+ only shows up in the Record Tab of pavucontrol, when the Audio Trigger is switched on!
   

YMMV - Works for me. (Sorry for the Screenshot in German)

The right keyword for your own search: pulseaudio loopback or alsa loopback.

[mcallegari]

Thanks for sharing

[MontyZuma]

1. Open a shell and load the PulseAudio loopback module:

   Code: Select all

   pactl load-module module-loopback

It's possible to add the module in the system-wide config file: /etc/pulse/defauld.pa so you don't have to use a shell every time you want to use a mp3 as an audio input.

[MDSurveyor]

MontyZuma, thank you for your detailed answer. You seem very knowledgeable regarding Linux and QLC+. I love the program and I am having a similar problem with Audio but I am not sure if it is a Linux issue or a QCL+ issue. I had also posted in the general section yesterday, but I can't find the post! Oh well, new to the forum and probably did something wrong.

Anyway, my goal is to set the time of the duration widget for a chase from the tempo of a snare drum.

I have found the Audio tab and am able to select the input - I assume that I have the correct input selected because at the bottom of that section there is a small "play" icon and when clicked a level meter indicates incoming audio. When I go to the Virtual Console page and create the Audio widget I, it shows no signal. Also there is no audio level fader in the widget. I Do not understand what I am missing.

QLC Session Configuration:
Universe 1: All lights, INPUT from external MIDI foot controller
Universe 2: Passthrough, No lights, INPUT from OSC for remote iPad control
Universe 3 & 4: Nothing

OS: Linux Mint 18.1 Cinnamon

PC: Lenovo T61, 8GB RAM, NVIDIA graphics, Audio Device displayed in QLC is HDA Intel - AD1984 Analog

Thanks in advance for either helping or pointing me to the answer.

Joel