Watermark mp4/m4v in PHP -

is there way watermark mp4/m4v files in php? files saved on server, when displaying, want watermark put on through php (header-output).

here current php code:

$fp = fopen($path, 'rb');  // change header whatever file's mime type header("content-type: " . $ctype); header("content-length: " . filesize($path));  fpassthru($fp); exit;