Kdenlive has a visualizer effect you can use https://docs.kdenlive.org/en/effects_and_filters/video_effects/on_master/audio_spectrum_filter.html
It's not crazy but it works well enough for something simple.
this post was submitted on 04 Dec 2024
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I know that QMMP has a built-in visualizer, and the webpage says that the visualizer is call projectM, which you can apparently also run standalone: https://github.com/projectM-visualizer/projectm
Projectm goes way back.
Not exactly what you want, but FFmpeg can do waveforms
I do this for my partner's podcast
If you don't mind a steep learning curve one X change for endless possibilities: Blender
That would be amazing, but I already have my plate full with guitar, piano, Maschine, Deluge, and French. Still in queue are Renoise (tracker DAW), Arturia Pigments, Bitwig's funky chained synth thing amd Japanese.
I just something quick and easy so that I can post clips on Loops, etc.