首先安装ffmpeg 

<?phpset_time_limit(0) ;$cmd = "ffmpeg -i ‘input/3.mp4‘ -r 1 -q:v 2 -f image2 images/pic-%03d.jpeg";exec($cmd . " >> /var/log/php/cmd.log 2>&1",$log, $status);if($status == 0){ var_dump("执行成功");} else { var_dump("执行失败");}