I'm looking for a program that will visualize anything that goes through my audio-output (in this case it's Spotify) and display it on the screen. Does this exist?
I'm running Ubuntu.
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Sign up to join this communitycava is a fun one. It's a console application, so it's fairly lightweight. You can also run it in an ssh session from a different computer on the network.
Try using projectM.
Either the packages is already in your sources or you can compile the source code from sourceforge.
There are packages for pulseaudio and JACK. ProjectM is able to directly use the audio output or your OS.
projectm-pulseaudio
(jack is also available). However I had to unmute an input monitor as described here askubuntu.com/a/532767/64513 in order to get some signal to the visuals. But otherwise: cool!
This archive from linuxaudio.org has many different visualizers.
found Synaesthesia to be both beautiful and easy to use, it also works well with pulseaudio through the command
padsp synaesthesia line
website: http://logarithmic.net/pfh/synaesthesia
it is available in ubuntu repositories