Mp4 files codec not found - php

Question

I create a script to download video from remote host the content length of file is shows correct and download properly without any interruptions. But When playing video file it shows error The Player might not support the file type or might not support the codec that was used to compress the file.
Here is my php code
ini_set('max_execution_time', 0);
$useragent = "Mozilla/5.0 (X11; Linux amd64; rv:21.0) Gecko/20100101 Firefox/21.0";
$url=($_GET['q']);
$headers = array(
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
"Accept-Encoding: gzip, deflate, br",
"Accept-Charset: utf-8;q=0.7,*;q=0.3",
"Accept-Language:en-US;q=0.6,en;q=0.4",
"Connection: keep-alive",
);
$v = $url;
$ch = curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 222222);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_URL, $v);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_USERAGENT, $useragent);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$info = curl_exec($ch);
$size2 = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
$namer= basename($v,"=m18");
header('Connection: Keep-Alive');
header('Content-Type: video/mp4; charset=');
header('Content-Transfer-Encoding: binary\n');
header('Content-Description: File Transfer');
header('Accept-Ranges: bytes');
header('Content-Length: ' . $size2);
header('Expires: 0');
header('Cache-Control: private');
header('Pragma: no-cache');
//header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Content-Disposition: inline; filename=");
echo($v);