224096 2021-04-02 00:37:41 -0700 Sped-up videos in Safari Technology Preview Release 123 are pitch shifted 2021-04-02 08:58:28 -0700 1 1 1 Unclassified WebKit Media Safari Technology Preview Mac (Intel) macOS 11 NEW InRadar P2 Normal --- 1 saagar webkit-unassigned eric.carlson jer.noble webkit-bug-importer oldest_to_newest 1746405 0 saagar 2021-04-02 00:37:41 -0700 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/ 1746510 1 webkit-bug-importer 2021-04-02 08:58:28 -0700 <rdar://problem/76150150>