independentla.blogg.se - Ffmpeg filter streams at input

For example, in the left third, middle third and right third of the input box, we can use the command:įfmpeg -i input -vf crop=iw/3:ih:0:0 outputįfmpeg -i input -vf crop=iw/3:ih:iw/3:0 outputįfmpeg -i input -vf crop=iw/3:ih:iw/3*2:0 output （1）裁剪 100x100 的区域，起点为(12,34).The value of x can be obtained from the value of y and vice versa.

The value of ow can be obtained from oh and vice versa, but not from x and y, because these values are performed after ow and oh.

If the optional keep_aspect parameter is used, the output SAR (sample aspect ratio) will be changed to compensate for the new DAR (display aspect ratio).

The default value of x is (iw-ow)/2, and the default value of y is (ih-oh)/2

The calculated value of x (the number of pixels in the horizontal direction from the upper left corner) and y (the number of vertical pixels) are evaluated for each frame.

x and y are the coordinates of the upper left corner of the output, and the center of the coordination system is the upper left corner of the input video frame.

Crop the width and height of the input video frame from the position indicated by the x and y values to the specified width and height.Course learning address: įFmpeg video multi-grid processing FFmpeg filter Video crop.