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Big Sur broke medium/high-def Quicktime and browser video on Macbook Pro (early 2015)

I upgraded to Big Sur and now I can't even play mp4s offline with Quicktime. I can watch YouTube videos if I drop resolution to 244. Zoom works since because I assume it's a similar video resolution. Is there anything I can do to restore normal video playback? There was never a problem before the upgrade.

MacBook Pro 13″, macOS 10.14

Posted on Nov 18, 2020 11:05 AM

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Posted on Nov 18, 2020 4:52 PM

Happening to me too, totally should have had a disclaimer about potentially being this unstable. Have a test tomorrow and can't study for it because I can't watch the lectures. Feels like I downloaded a beta not an actual release, telling everyone I know not to update.


I was expecting bugs but not something like downloaded videos being completely unplayable. The audio and video is completely out of sync, trying to skip to a certain section takes forever like I'm streaming it online using 3G, and sometimes it just completely crashes.


This on a MacBook Air 2017

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Question marked as Top-ranking reply

Nov 18, 2020 4:52 PM in response to alext1975

Happening to me too, totally should have had a disclaimer about potentially being this unstable. Have a test tomorrow and can't study for it because I can't watch the lectures. Feels like I downloaded a beta not an actual release, telling everyone I know not to update.


I was expecting bugs but not something like downloaded videos being completely unplayable. The audio and video is completely out of sync, trying to skip to a certain section takes forever like I'm streaming it online using 3G, and sometimes it just completely crashes.


This on a MacBook Air 2017

Big Sur broke medium/high-def Quicktime and browser video on Macbook Pro (early 2015)

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