problem playing video in mobile through php

<?php

       /*$file = "d.mp4";
       $file_size = filesize($file);
       $fp = fopen($file, "rb");
       $data = fread ($fp, $file_size);
       fclose($fp);
       header ("Content-type: video/mp4");
       echo $data; */

$path = 'f.mp4';
if (file_exists($path))
{
$size=filesize($path);
$fm=@fopen($path,'rb');
$begin=0;
$end=$size;
if(isset($_SERVER['HTTP_RANGE'])) {
if(preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i',
$_SERVER['HTTP_RANGE'],$matches)){
$begin=intval($matches[0]);
if(!empty($matches[1])) {
$end=intval($matches[1]);
}
}
}
if($begin>0||$end<$size)
header('HTTP/1.0 206 Partial Content');
else
header('HTTP/1.0 200 OK');
header("Content-Type: video/mp4");
header('Accept-Ranges: bytes');
header('Content-Length:'.($end-$begin));
header("Content-Disposition: inline;");
header("Content-Range: bytes $begin-$end/$size");
header("Content-Transfer-Encoding: binary\n");
header('Connection: close');
$cur=$begin;
fseek($fm,$begin,0);
while(!feof($fm)&&$cur<$end&&(connection_status()==0))
{
print fread($fm,min(1024*16,$end-$cur));
$cur+=1024*16;
usleep(1000);
}
die();
}

   ?>


problem is that it works fine in pc browser, but after playing it in mobile browser it gets hanged when size of video is large for small video it works fine in mobile browser.

What could be the problem