Pseudo Stream of MP4 files on Laravel

mp4-strem-laravel.php

<?php 
Route::get('mp4-stream/{filename}', function($filename){
    $contentType = "video/mp4";
    $path = $filename;
    $fullsize = filesize($path);
    $size = $fullsize;
    $stream = fopen($path, "r");
    $response_code = 200;
    $headers = array("Content-type" => $contentType);
    
    // Check for request for part of the stream
    $range = Request::header('Range');
    if($range != null) {
        $eqPos = strpos($range, "=");
        $toPos = strpos($range, "-");
        $unit = substr($range, 0, $eqPos);
        $start = intval(substr($range, $eqPos+1, $toPos));
        $success = fseek($stream, $start);
        if($success == 0) {
            $size = $fullsize - $start;
            $response_code = 206;
            $headers["Accept-Ranges"] = $unit;
            $headers["Content-Range"] = $unit . " " . $start . "-" . ($fullsize-1) . "/" . $fullsize;
        }
    }
    
    $headers["Content-Length"] = $size;
    
    return Response::stream(function () use ($stream) {
        fpassthru($stream);
    }, $response_code, $headers);
});