php live output for bash script if output is filtered

Question

First.. my php knowledge are very poor.

The target is to display the live content of an bash script via a web page. The bash script itself as three tasks:

1. prepare data
2. some infos to the user
3. execute a bin file

All works... but the displayed content is not what i expect. more precisely: the chronological sequence

The bin file produce a large amount of unneeded information. So i use grep and sed to filter the content:

If i dont filter with "grep" and "sed"... the output is live.

If i use "grep" and "sed".... the output of the bin file is only after the execution displayed.

Timecode 0s: Hello
Timecode 17:  Generating Baseline: 1/9  4000/4000 6.586
Timecode 17:  Generating Agi: 2/9  4000/4000 6.563
Timecode 17: Generating AP: 3/9  4000/4000 6.567

that's how the output should be:

Timecode 0s: Hello
Timecode 4:  Generating Baseline: 1/9  4000/4000 6.586
Timecode 6:  Generating Agi: 2/9  4000/4000 6.563
Timecode 10: Generating AP: 3/9  4000/4000 6.56

Why? How i can solve this problem... filter the output of "simc" and forward the output live?

The code:

bash script part:

#!/bin/bash
echo "Hello"
simc $PLAYER $COMMAND html=/tmp/report_manual.html | grep --line-buffered "Generating" | sed 's/\[.*\]//g'

exit

• also tested without "--line-buffered"

php script part:

<?php
ob_end_flush();
ob_implicit_flush();

$char_name = $_POST["char_name"];

$cmd = "bash /home/nas/script/simc/webclient.sh {$char_name} 2>&1";

while (@ ob_end_flush()); // end all output buffers if any
        $proc = popen($cmd ,'r');
        echo '<pre>';
while (!feof($proc))
{
        echo fread($proc, 2098);
        @ flush();
}
echo '</pre>';
?>

EDIT: PHP reading shell_exec live output did not cover my question.