PHP 实现大文件视频推流

/**
     * 视频推流
     * 返回视频流
     */
    function bofang(){
        set_time_limit(0);
        ini_set(‘max_execution_time‘, 0);//秒为单位，自己根据需要定义
        ini_set("memory_limit",-1);
        $moviePath = FCPATH.‘movie‘.DIRECTORY_SEPARATOR;
        $filename = $moviePath.‘afanda.mkv‘; // 视频地址
        $file = new \SplFileObject($filename, ‘rb‘);
        $size   = $file->getSize(); // File size
        $length = $size;           // Content length
        $start  = 0;               // Start byte
        $end    = $size - 1;       // End byte
        header(‘Content-type: audio/mp4‘);
        header("Accept-Ranges: 0-$length");
//        $_SERVER[‘HTTP_RANGE‘] = ‘bytes=0-‘;  // 会发生2次请求，会携带断点缓存需要加载的视频流 0- 表示从头加载文件尾，8G文件读取会卡
        if (isset($_SERVER[‘HTTP_RANGE‘])) {
            $c_start = $start;
            $c_end   = $end;
            list(, $range) = explode(‘=‘, $_SERVER[‘HTTP_RANGE‘], 2);
            if (strpos($range, ‘,‘) !== false) {
                header(‘HTTP/1.1 416 Requested Range Not Satisfiable‘);
                header("Content-Range: bytes $start-$end/$size");
                exit;
            }
            if ($range == ‘-‘) {
                $c_start = $size - substr($range, 1);
            }else{
                $range  = explode(‘-‘, $range);
                $c_start = $range[0];
                $c_end   = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
            }
            $c_end = ($c_end > $end) ? $end : $c_end;
            if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {
                header(‘HTTP/1.1 416 Requested Range Not Satisfiable‘);
                header("Content-Range: bytes $start-$end/$size");
                exit;
            }
            $start  = $c_start;
            $end    = $c_end;
            $length = $end - $start + 1;
            $file->fseek($start);
            header(‘HTTP/1.1 206 Partial Content‘);
        }
        header("Content-Range: bytes $start-$end/$size");
        header("Content-Length: ".$length);
        $buffer = 1024 * 8;
        $strNum = 1024*10; // 如果8G 读取 8kb，估计会循环上百万次，就会陷入无限等待中...

        while(!$file->eof() && $start <= $end) {
            $strNum--;
            if( $strNum <= 0 )
                break;
            //if( $start >= $end )
                //$buffer=0;
            echo $file->fread($buffer);
            $file->next();
//            ob_flush();
            $file->fflush();
        }
        //关闭文件对象
        $file = null;
        exit();
    }