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    Rotate or flip a clip in QuickTime Player on Mac
You can rotate a clip to the left or right, or flip it horizontally or vertically.
- In the QuickTime Player app - on your Mac, open the movie. 
- Choose View > Show Clips, then select the clip. - The selected clip is outlined in yellow. 
- From the Edit menu, choose to rotate the clip left or right, or flip it horizontally or vertically. 
- When you’re finished, click Done.