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Fixing the aspect ratio
Sometimes, when you watch videos on a display with different proportions, you may experience stretching or black bars around the edges. To prevent that, you can change the video's proportions to adapt it to the display beforehand.
Black bars and stretching when watching a 4:3 video on a 16:9 screen.
What is the aspect ratio?
A video's aspect ratio is the ratio between its width and height. The two most commonly used aspect ratios are 4:3 and 16:9, the former used by most analog television broadcasts, while the latter, also referred to as widescreen – in films, DVDs, and modern HD video.
A visual comparison of two popular aspect ratios.
Enter edit mode
Click the Edit button next to the file your file and switch to the Crop tab or select Crop in the Tools tab.
Fix the aspect ratio
Make sure that the Maintain aspect ratio option is selected and choose your display's aspect ratio. This will set the crop frame to these proportions.
In the player, drag the frame's edges so that it covers as much of the video as possible. Drag the frame to the center of the video.
Exit edit mode
Click Apply to accept the aspect ratio changes, and then click Done to close the editing window.
