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I have trouble. When I try to play YouTube videos, they play super fast. I'd include a video of the problem but it would be too large. Suffice it to say that a 24 minute video finishes in less than 5 seconds when I hit the Play button. This is new with Big Sur. I just installed beta 9 last night. I have turned off all extensions, deleted my history, restarted Safari, all to no avail. The problem happens with Chrome too so might be a QuickTime problem or something underlying.

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This is a commonly reported bug that occurs 'sometimes'. Another solution, short of rebooting, is to kill the coreaudiod process.

You can do this in Activity Monitor, or in the Terminal with sudo killall coreaudiod

https://9to5mac.com/2019/07/29/macos-fast-video-playback-bug-fix-coreaudiod-video/

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  • I would just like to add that it isn't always coreaudiod. I had this exact same issue, but no coreaudiod listed in Activity Monitor. I saw an Apple community post mentioning that coreaudiod would have multiple hours of CPU Time in Activity Monitor. I instead had either Microsoft Remote Desktop or another program listed with many hours of CPU Time. I killed those two processes and it resolved the issue immediately. I am not sure which one it was, in all I had killed RDP, Discord, and one other thing and one of those three items fixed it. Sep 19 at 18:21
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"Solved" by rebooting! Sorry to waste your time... lesson for the next guy I guess! Cheers.

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