Bug 224096

Summary: Sped-up videos in Safari Technology Preview Release 123 are pitch shifted
Product: WebKit Reporter: Saagar Jha <saagar>
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: eric.carlson, jer.noble, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Mac (Intel)   
OS: macOS 11   

Description Saagar Jha 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/
Comment 1 Radar WebKit Bug Importer 2021-04-02 08:58:28 PDT 
<rdar://problem/76150150>