1.mp4转yuv命令行ffmpeg -i  input.mp4 -ss 00:00:00 -t 00:00:10 output.yuv或者ffmpeg -i input.mp4 -f rawvideo output.yuv或者ffmpeg -i input.mp4 -ss 00:00:00 -t 00:00:10  -pix_fmt yuv420p output.yuv或者ffmpeg -i