Then run the command: ffmpeg -i in.mp4 -filter:v "scale=iw*min($width/iw\,$height/ih):ih*min($width/iw\,$height/ih), pad=$width:$height:($width-iw*min($width/iw\,$height/ih))/2:($height-ih*min($width/iw\,$height/ih))/2" out.mp4 It's a tad long, but you'll have to specify the padding some way.įirst, in your shell define output width and height: width=700 Here's the command that'd add pillar- or letterboxing for a fixed output width. You can provide a hex value or use a supported color name. If you are inputting a series of images, and the images vary in size, add the eval=frame option in the scale filter, such as: ffmpeg -i input -vf "scale=1280:720:force_original_aspect_ratio=decrease:eval=frame,pad=1280:720:-1:-1:color=black" output Using input images that each vary in size Using the crop filter to cut off the excess: ffmpeg -i input -vf "scale=1280:720:force_original_aspect_ratio=increase,crop=1280:720" output 4:3 input aspect ratio, 16:9 output aspect ratio. For example, an input with a 2.35:1 aspect ratio fit into a 16:9 output will result in letterboxing.Ħ40x480 (4:3) input into 1280x720 (16:9) output without upscaling. Letterboxing will occur instead of pillarboxing if the input aspect ratio is wider than the output aspect ratio. If you want to avoid upscaling see the example below. Use the crop filter to cut off the excess.
Add black bars (or any other color) with pad filter to pillarbox or letterbox the image to fit properly, or.
In these examples the original image will be scaled to fit into a 1280x720, 16:9 aspect ratio output while preserving the original aspect ratio. Represents a 640x480, 4:3 aspect ratio video. A simple method is to use the force_original_aspect_ratio option in the scale filter.
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