Disable the rounded corners in QuickTime Player X

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It’s possible to disable the rounded window corners while playing a movie in QuickTime, use the following command to disable them. 

defaults write com.apple.QuickTimePlayerX MGCinematicWindowDebugForceNoRoundedCorners 1

To make the command take effect, you need to restart QuickTime.

Revert to the default setting (manual play) change value 1 in 0.

defaults write com.apple.QuickTimePlayerX MGCinematicWindowDebugForceNoRoundedCorners 0

The result:

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