FFmpeg滤镜效果--剪切crop

crop=W:H:X:Y 参数说明

• w: the width of the output video
• h: the height of the output video
• x: the horizontal position from where to begin cropping, starting from the left (with the absolute left margin being 0). defaults to the center (iw-ow)/2
• y: the vertical position from where to begin cropping, starting from the top of the video (the absolute top being 0). defaults to the center (ih-oh)/2
• other variables:
  • t: the timestamp expressed in seconds
  • n: the number of input frame, starting from 0;
  • a: same as iw/ih

命令用例

注意：输入必须是视频文件，不能是图片文件。

1. 静态剪切某个位置

# crop in center   100*100 pixel
ffplay -i input.mp4 -vf "crop=100:100"