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You don't need to make any modifications to the scale parameters because it will automatically substitute the actual values for "iw", "sar" and "ih".

It will scale the input image to fit the width and/or height of the desired output format without distorting the image. In this case, the math computes the new scaled width and height. The scale filter is powerful because it can perform value substitution and math. The video filters that are specified are applied sequentially to each frame. Specifies that some video filters follow in the command. Replace "input.mp4" with the name of your input file. This is the standard input method for ffmpeg. Let me break down this command for you: ffmpeg -i input.mp4 If you don't want to bother with re-encoding, then any player worth using should allow you to do this upon playback. padįfmpeg -i input -vf "scale=-1:720,pad=1280:ih:(ow-iw)/2" outputĪ more generic command that will work for all input file aspect ratios will use force_original_aspect_ratio=1 as an option to scale: ffmpeg -i input -vf "scale=w=1280:h=720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2" outputįfmpeg -i input -vf "scale=1280:-1,crop=iw:720" outputĪ more generic command that will work for all input file aspect ratios will use force_original_aspect_ratio=2 as an option to scale: ffmpeg -i input -vf "scale=w=1280:h=720:force_original_aspect_ratio=2,crop=1280:720" output Take a look at these examples and the documentation for each filter. You have two main options to make it fit after using scale: pad or crop.