This sound problem just started for me about a week ago while watching Youtube videos. Xcode is not running.
Catalina 10.15.7, iMac (27-inch, Late 2012), 3.4 GHz Quad-Core Intel Core i7, 32 GB 1600 MHz DDR3
Restarting coreaudiod fixes it temporarily for me.
My MBP13 with Big Sur 11.2.3 works just fine.
Kennerty
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