<?php
function my_ff_exec($cmd,$path)
{$proc=proc_open($cmd, array(0=>array('pipe', 'r'), 1=>array('pipe', 'w'), 2=>array('pipe', 'w')), $pipes);
    fwrite($pipes[0], "");fclose($pipes[0]);
    $stdout = "";
    $fin = 0;
    $informProgress = 10;
    if (is_resource($proc)) {
        while ($s = fgets($pipes[2])) {
			print_r($s);
            preg_match('/Duration: ([0-9]{2}):([0-9]{2}):([^ ,])+/', $s, $matches);
			if(isset($matches[0])){
			print_r($matches);
				$time = str_replace("Duration: ", "", $matches[0]);
				$time_breakdown = explode(":", $time);
				$total_seconds = round(($time_breakdown[0]*60*60) + ($time_breakdown[1]*60) + $time_breakdown[2]);
				shell_exec('"C:\xampp\htdocs\ffmpeg\bin\ffmpeg.exe" -y  -i '.$path." -f mjpeg -vframes 1 -ss " . ($total_seconds / 2) . " -s {$w}x{$h} screan.jpg");
            
			}
			//$stdout = $stdout.$s;
            flush();
            //ob_flush();
        }
    }
    $stdout.=stream_get_contents($pipes[1]);fclose($pipes[1]);
    $stderr=stream_get_contents($pipes[2]);fclose($pipes[2]);

    $rtn=proc_close($proc);
    return array('fin'=>$fin,
        'stdout'=>$stdout,
        'stderr'=>$stderr,
        'return'=>$rtn
    );
}
$file_name_with_full_path2 = 'C:\xampp\htdocs\2.mp4';
$output = my_ff_exec('"C:\xampp\htdocs\ffmpeg\bin\ffmpeg.exe" -i '.$file_name_with_full_path2 ,$file_name_with_full_path2);
print_r($output);