First, open your terminal (Command-t on Mac, Control-t on Linux, BSD, etc., and for Windows folks, I suggest cmder) and navigate to the folder containing the video you want to convert from vertical to horizontal. Hit Enter.
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How to Convert Vertical Video to 16:9 Horizontal in Just 1 Step
First, open your terminal (Command-t on Mac, Control-t on Linux, BSD, etc., and for Windows folks, I suggest cmder) and navigate to the folder containing the video you want to convert from vertical to horizontal. Hit Enter.
Full article