Not getting proper range value when using partial content header - php

Question

I'm trying to playback an mp4 that resides outside my web root. Had no issue there except that I couldn't seek within the video. Research lead me to the http "206 partial content" header.
This is the php that serves the file:
const STORAGE_PATH = '/home/files/';
$filename = "my_video.mp4";
$file = STORAGE_PATH.$filename;
$size = filesize($file);
$begin = 0;
$end = $size - 1;
header('Content-Type: video/mp4');
header('Accept-Ranges: bytes');
if (isset($_SERVER['HTTP_RANGE'])){
$range = substr($_SERVER['HTTP_RANGE'], strpos($_SERVER['HTTP_RANGE'], '=')+1);
$range = explode('-', $range);
$begin = intval($range[0]);
$end = (isset($range[1]) && !empty($range[1])) ? intval($range[1]) : $size-1;
$length = $end - $begin + 1;
header('HTTP/1.1 206 Partial Content');
header("Content-Range: bytes $begin-$end/$size");
fseek($f, $begin);
}
$length = ($end - $begin) + 1;
header('Content-Length:' .$length);
header('Content-Disposition: inline; filename="'.$filename.'"');
//header('Content-Transfer-Encoding: binary');
//header('Expires: 0');
//header('Cache-Control: must-revalidate');
//header('Pragma: public');
echo fread($f, $length);
flush();
fclose($f);
exit();
When I load the page with the html5 video tag, it fails to load the video with the following console error:
net::ERR_CONTENT_LENGTH_MISMATCH 206 (Partial Content)
With chrome dev tools, it's showing the requested header is only sending the first range value but not the second.
Range: bytes=0-
In response, my script is sending back the entire range of the file since it's not finding a specific range from the server. I'm not sure where the problem is at this point.