基本使用命令

ffmpeg -i input.mp4 output.avi    //视频格式转换ffmepg -i input.mp4 -r fps image%3d.jpg    //视频转成图片//fps is num of picture per second;//%3d will generate picture named three digit numffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0+0,0 output.avi    //用ffmpeg抓屏//This will grab the image from desktop, starting with the upper-left corner at (x=100, y=200) with the width and height of 1024x768