How to play mp4 video from url in php

I want to play mp4 video from url but not playing..

This is php code mp4.php

$video_file = 'https://opsukrat.in/Test.mp4';

$size = filesize($video_file);

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

header("Content-Length: ".$size);

readfile($video_file);

This is html code

<video width="480" height="320" controls>

  <source src="mp4.php" type="video/mp4">

</video>