FFmpeg gets the original input video width ( iw ) And height ( ih ) Values, so you can use these values to perform mathematical operations (e.g.

This does not apply to pictures, which is why you can’t see a separate example with screenshots here

There is also an optional keep_aspect Options you can set to 1 Force the output to display the same aspect ratio as the input (example usage: 'crop=100:100:0:0:keep_aspect=1' ).

in case x with y Is omitted, so x The default is (iw-w)/2 with y to (ih-h)/2.

output.mp4 Is the new cropped video file.

y The vertical position cropped from the top of the video (the absolute top is 0 ).

x The horizontal position of the crop from the left (the absolute left margin is 0 ).

h The height of the output video (the height of the cropped area), the default is the height of the input video (the height of the input video = ih With in_h Is another representation of the same thing) out_h Can also replace h.w The width of the output video (that is, the width of the cropping area), the default is the input video width (input video width = iw ,versus in_w ) out_w Can also replace w.'crop=W:H:X:Y' Indicates that we are using a “cropped” video filter with 4 values:.-filter:v (Can be abbreviated as -vf ) Specify that we are using a video filter.-i input.mp4 Specify the input video ( input.mp4 In this case input/original video).The FFmpeg command line program is its core, which can be used for transcoding, basic editing, video scaling and post-production effects. FFmpeg It is a free and open source project consisting of various libraries and programs for processing video, audio and other multimedia files and streams. To be able to use these commands, you need to have FFmpeg Install on your system. This is possible because the same command can also be used for cropping. To illustrate the application of the FFmpeg crop filter, I use this 500×300 image, where each square is 100×100 pixels in size:įor each example command, the image is cropped using the actual FFmpeg crop command in that example, so you can see exactly what happens when you use it. This article also includes screenshots, which can accurately show what is being cropped. This is especially useful for batch cropping of multiple videos, but when doing some video cropping, some (including myself) may prefer this feature than full-fledged video editors. This article explains how to use FFmpeg (With examples) From the command line.

Ffmpeg crop same quality