PHP CURL MP4 file headers - php

Question

I am using a HTML5 player to play a video on website, the video is grabbed from CDN. By Using CURL I am getting the file from CDN but when I try to play that in browser I am not able to play it, so I think that headers are not set properly for the file.
Here is my code:
if (!empty($path) && $path != null)
{
$ch = curl_init($path);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$data = curl_exec($ch);
curl_close($ch);
if ($data === false)
{
echo 'CURL Failed';
exit;
}
if (preg_match('/Content-Length: (\d+)/', $data, $matches))
{
$contentLength = (int) $matches[1];
}
header('Content-Transfer-Encoding: binary');
header('Content-Type: video/mp4');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Content-Length: ' . $contentLength);
ob_clean();
flush();
echo $data;
exit;
}
Are the headers set properly to play a MP4 file? Cause when I hit the URL video is not played. The video file is MP4 and I am trying to play this file in chrome(chrome supports mp4 file). The direct URL access to file is http://moviese.s3.amazonaws.com/videos/test7.mp4