Here, we can make use of the same scaling commands with the use of variables that indicate the parameters of a video. Hence, the width is supposed to be scaled at 1920/1.5= 1280 pixels. This will give us a resolution of 1280×720. This happens because 1920/320 = 6 which equals to 180 pixels.įFmpeg -i input.mp4 -vf scale=-1:720 output.mp4 The video will result in a resolution of 320×180. In order to get the resolution of 320×180, this following command is to be followed:įFmpeg -i input.mp4 -vf scale=320:-1 output.mp4 In order to change the resolution whilst keeping the aspect ratio intact, here’s what is to be considered-įor example, if we are selecting the resolution, let’s choose 1920×1080. While resizing a video & retaining the aspect ratio, we need to set the parameters in a particular way i.e, to set either the width or the height to -1.įor example- we set the width to -1 and then set the height and vice versa. if the width of the image is x unit and the height is y unit, the aspect ratio would be x : y. The aspect ratio means the ratio of the image’s width to its height.įor e.g. To be able to maintain the aspect ratio whilst changing the resolution can be difficult. To rescale videos with ease, you’ll have to follow this command:įFmpeg -i input.avi -vf scale=320:240 output.avi 3. $w & $h here, indicate the necessary width and height. Enter the following command to resize videos: FFmpeg -i input.mp4 -vf scale=$w:$h output.mp4 Select the ‘Scale’ filter from the Effects section of FFmpeg.

Let’s look at how we can do the following in FFmpeg: 1. Ffprobe -v error -select_streams v:0 -show_entries stream=width, height -of csv=s=x:p=0 input.mp4

Ffmpeg resize on output