截取一张图片
ffmpeg -ss 00:00:05 -i 1.mp4 -vframes 1 1.jpg
预览视频
ffplay -f lavfi -i "movie=1.mp4,delogo=x=57:y=673:w=600:h=352:show=1”
去除水印
ffmpeg -i 1.mp4 -vf "delogo=x=57:y=673:w=600:h=352" -c:a copy out.mp4
