NEW 224096
Sped-up videos in Safari Technology Preview Release 123 are pitch shifted 
https://bugs.webkit.org/show_bug.cgi?id=224096
Summary Sped-up videos in Safari Technology Preview Release 123 are pitch shifted
Saagar Jha
Reported 2021-04-02 00:37:41 PDT
Obligatory: this is not an April Fools joke. On Safari Technology Preview Release 123 (I checked Release 122–it works fine there), running on macOS Big Sur 11.3 Beta (20E5224a), when I adjust the playback rate of <video> elements the audio becomes pitch shifted, so people in sped-up video sound like they're characters from Alvin and the Chipmunks (and when slowed down their voices are comically deep). I can reproduce this on pretty much every video element other than YouTube for some reason. Here's a sample website that reproduces this easily: https://developer.apple.com/videos/play/wwdc2020/10663/
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Radar WebKit Bug Importer
Comment 1 2021-04-02 08:58:28 PDT
<rdar://problem/76150150>
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