MP4 videos (MPEG-4s) are one of the standard video formats supported by QuickTime Player and QuickTime Pro. Any video that can play in QuickTime can be flipped or rotated 90 degrees to 180 degrees simply by editing the movie's properties. Users can transform the resolution (amount of pixels) and alter the original video's aspect ratio after rotating the video to preserve its quality. Note that rotating a video 90 degrees will result in a longer vertical picture than its original if the aspect ratio and resolution are left unchanged.
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Navigate to the desired MP4 file on your computer. Right-click its icon and choose to open it in QuickTime. Wait for your video to load in its own player window.
Click the "Window" tab at the top of the QuickTime menu. Select "Show Movie Properties."
Highlight the "Video Track" at the top of the "Properties" screen.
Click the "Visual Settings" tab in the middle of the screen.
Click one of the "Flip/Rotate" buttons in the lower-right side of your screen, depending on which way you want the MP4 rotated. Options include 90 and 180 degrees clockwise and counter-clockwise.
Exit out of the "Movie Properties" window and save your video by clicking "File > Save As..."
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