Mac loses ability to play video

Dear Lazyweb,

About once a week, macOS 10.15.7 loses the ability to play video. Press play and it goes super-fast-forward all the way to the end. Scrubbing while paused works, but any attempt to play fails in any app using AVPlayer -- not just QuickTime Player, but also jwztv and even "Notes". VLC works, but obviously that doesn't help me.

Sound familiar? Any idea how to un-fuck it without rebooting?

I don't see anything obvious in the system logs, but they are so comically verbose that it's impossible for me to tell.

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