![]() ![]() ![]() 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. This can be done like this: ffmpeg -i in.mp4 -filter:v "crop=in_w:480" out.A simple method is to use the force_original_aspect_ratio option in the scale filter. Once you get the video, it may be bigger than the expected 720x480 since you let ffmpeg compute the height, so you’ll have to crop it. So you could type: ffmpeg -i in.mp4 -vf scale=720:-2 out.mp4 Actually, -2 is a better choice since the computed value should even. You can set the width or height to -1 in order to let ffmpeg resize the video keeping the aspect ratio. With a reasonably recent ffmpeg, you can resize your video with these options: ffmpeg -i in.mp4 -vf scale=720:480 out.mp4 I’m no ffmpeg guru, but this should do the trick.įirst of all, you can get the size of input video like this: ffprobe -v error -of flat=s=_ -select_streams v:0 -show_entries stream=height,width in.mp4 ![]()
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