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I had ended up using ffmpeg a few times for this (i think inspired by the link you gave there) because it's often easier to share video than just audio on mainstream social media

A few details of what worked for me and the output shown here:

https://discourse.mozilla.org/t/tts-audio-to-video-trick-usi...

But Astrofox looks much cooler and massively more sophisticated.

The key to all audio/music visualizations is the Fast Fourier Transform. Hook a FFT implementation to a graphics library and you are set.

You can use revoldiv.com. If you go to export and choose audiogram, it will convert the audio/video you uploaded to text and create an audiogram.

vvvv not open source but has a free version:

https://vvvv.org/