webVideoViewer/readfile.php

<?php

if(!isset($_GET['file']) || !$_GET['file']) {
    die();
}

header('Content-Type: video/mp4');

$handle = fopen($_GET['file'], "r");
$filesize = filesize($_GET['file']);
$fs = 2097152; // 2mb
while($fs < $filesize) {
    echo fread($handle, $fs);
    $fs += 2097152; // 2mb per cycle
}
fclose($handle);