Proc_open read and parse output - real-time

When I run proc_open with a file.txt path for the stderr output, that file is constantly updated every couple seconds with output of the proc_open program I am running which is ffmpeg. I just want to redirect that output to a phpfile where it can be read and parsed but while 开发者_如何学JAVAthe process is running (so send info every couple seconds) so I can update a database. IS this possible? I have been googling for hours so if there are any experts out there who actually know how to use this function of have experience in this I would greatly appreciate any help.

this puts output in a text doc. If I change to 2 => array("pipe","w") and the echo the output only comes on my screen at the end of the process

$descriptorspec = array(
0 => array("pipe","r"),
1 => array("pipe","w"),
2 => array("file","/home/g/Desktop/test.txt","a")
) ;

$cwd = './' ;
// open process /bin/sh
$process = proc_open("/usr/local/bin/ffmpeg -i /home/g/Desktop/vid.wmv /home/g/Desktop/vid.flv", $descriptorspec, $pipes, $cwd) ;

1. you could run ffmpeg like this:

   ffmpeg ..optinons... 2>&1 | php script.php
   

But you could have in input STDERR and STDOUT of ffmpeg

1. And second normal decision:

   <?
   $cmd = 'ffmpeg -i /home/azat/Desktop/src.avi -y /home/azat/Desktop/dst.avi';
   $pipes = array();
   $descriptors = array(2 => array('file', '/tmp/atest.log', 'a'));
   
   $p = proc_open($cmd, $descriptors, $pipes);
   
   while (true) {
           sleep(1);
   
           $status = proc_get_status($p);
           if (!$status['running']) break;
   
           echo "STEEL RUN\n";
           // some manupulations with "/tmp/atest.log"
   }
   

Also you can see this class - it is a wrapper for exec processes