[PHP] ไม่สามารถใช้โค๊ด force download กับไฟล์ mp4 ได้

$filename = 'test.mp4';
$filelocation = '../file/vdo/'.$filename;
			

header('Pragma: public');
header('Expires: 0');	
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ($filelocation)).' GMT');
header('Cache-Control: private',false);
header('Content-Type: video/mp4');
header('Content-Disposition: attachment; filename="'.basename($filelocation).'"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($filelocation));
header('Connection: close');
readfile($filelocation);