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Re:Show HN: YouTube Musical Spectrum – visualizer for YouTub... by mfcc64 on Tuesday August 10, 2021 @10:56PM (#28137412)
>Why does the extension on Firefox block AV1 by default? It seems unrelated to the purpose of the extension.

Because AV1's decoding is slow and on some low-end hardware it makes the animation stutter.

> Also have you considered coloring the spectrum according to the musical note? So every C is red, every E is green, every G is cyan, etc.

The color is used for left-right channel separation.

Re:Show HN: YouTube Musical Spectrum – visualizer for YouTub... by xnzakg on Wednesday August 11, 2021 @05:02AM (#28139712)
cnlohr's colorchord does something similar to what you mentioned.

https://github.com/cnlohr/colorchord