diff --git a/classes/Config.php b/classes/Config.php
index 0c1aa8c..77cfa57 100644
--- a/classes/Config.php
+++ b/classes/Config.php
@@ -31,7 +31,7 @@ class Config
 
     public $youtubedl = 'vendor/rg3/youtube-dl/youtube_dl/__main__.py';
     public $python = '/usr/bin/python';
-    public $params = '--no-playlist --no-warnings -f best';
+    public $params = array('--no-playlist', '--no-warnings', '-f best');
     public $convert = false;
     public $avconv = 'vendor/bin/ffmpeg';
     public $curl_params = '';
diff --git a/classes/VideoDownload.php b/classes/VideoDownload.php
index ea0ca2c..8643207 100644
--- a/classes/VideoDownload.php
+++ b/classes/VideoDownload.php
@@ -13,6 +13,7 @@
 namespace Alltube;
 
 use Symfony\Component\Process\Process;
+use Symfony\Component\Process\ProcessBuilder;
 
 /**
  * Main class
@@ -27,19 +28,31 @@ use Symfony\Component\Process\Process;
  * */
 class VideoDownload
 {
+    public function __construct()
+    {
+        $this->config = Config::getInstance();
+        $this->procBuilder = new ProcessBuilder();
+        $this->procBuilder->setPrefix(
+            array_merge(
+                array($this->config->python, $this->config->youtubedl),
+                $this->config->params
+            )
+        );
+    }
+
     /**
      * Get the user agent used youtube-dl
      *
      * @return string UA
      * */
-    public static function getUA()
+    public function getUA()
     {
-        $config = Config::getInstance();
-        $cmd = escapeshellcmd(
-            $config->python.' '.escapeshellarg($config->youtubedl).
-                ' '.$config->params
+        $this->procBuilder->setArguments(
+            array(
+                '--dump-user-agent'
+            )
         );
-        $process = new Process($cmd.' --dump-user-agent');
+        $process = $this->procBuilder->getProcess();
         $process->run();
         return trim($process->getOutput());
     }
@@ -49,14 +62,14 @@ class VideoDownload
      *
      * @return array Extractors
      * */
-    public static function listExtractors()
+    public function listExtractors()
     {
-        $config = Config::getInstance();
-        $cmd = escapeshellcmd(
-            $config->python.' '.escapeshellarg($config->youtubedl).
-                ' '.$config->params
+        $this->procBuilder->setArguments(
+            array(
+                '--list-extractors'
+            )
         );
-        $process = new Process($cmd.' --list-extractors');
+        $process = $this->procBuilder->getProcess();
         $process->run();
         return explode(PHP_EOL, $process->getOutput());
     }
@@ -69,18 +82,18 @@ class VideoDownload
      *
      * @return string Filename
      * */
-    public static function getFilename($url, $format = null)
+    public function getFilename($url, $format = null)
     {
-        $config = Config::getInstance();
-        $cmd = escapeshellcmd(
-            $config->python.' '.escapeshellarg($config->youtubedl).
-                ' '.$config->params
+        $this->procBuilder->setArguments(
+            array(
+                '--get-filename',
+                $url
+            )
         );
         if (isset($format)) {
-            $cmd .= ' -f '.escapeshellarg($format);
+            $this->procBuilder->add('-f '.$format);
         }
-        $cmd .=' --get-filename '.escapeshellarg($url)." 2>&1";
-        $process = new Process($cmd);
+        $process = $this->procBuilder->getProcess();
         $process->run();
         return trim($process->getOutput());
     }
@@ -91,23 +104,23 @@ class VideoDownload
      * @param string $url    URL of page
      * @param string $format Format to use for the video
      *
-     * @return string JSON
+     * @return object Decoded JSON
      * */
-    public static function getJSON($url, $format = null)
+    public function getJSON($url, $format = null)
     {
-        $config = Config::getInstance();
-        $cmd = escapeshellcmd(
-            $config->python.' '.escapeshellarg($config->youtubedl).
-                ' '.$config->params
+        $this->procBuilder->setArguments(
+            array(
+                '--dump-json',
+                $url
+            )
         );
         if (isset($format)) {
-            $cmd .= ' -f '.escapeshellarg($format);
+            $this->procBuilder->add('-f '.$format);
         }
-        $cmd .=' --dump-json '.escapeshellarg($url)." 2>&1";
-        $process = new Process($cmd);
+        $process = $this->procBuilder->getProcess();
         $process->run();
         if (!$process->isSuccessful()) {
-            throw new \Exception($process->getOutput());
+            throw new \Exception($process->getErrorOutput());
         } else {
             return json_decode($process->getOutput());
         }
@@ -121,23 +134,23 @@ class VideoDownload
      *
      * @return string URL of video
      * */
-    public static function getURL($url, $format = null)
+    public function getURL($url, $format = null)
     {
-        $config = Config::getInstance();
-        $cmd = escapeshellcmd(
-            $config->python.' '.escapeshellarg($config->youtubedl).
-                ' '.$config->params
+        $this->procBuilder->setArguments(
+            array(
+                '--get-url',
+                $url
+            )
         );
         if (isset($format)) {
-            $cmd .= ' -f '.escapeshellarg($format);
+            $this->procBuilder->add('-f '.$format);
         }
-        $cmd .=' -g '.escapeshellarg($url)." 2>&1";
-        $process = new Process($cmd);
+        $process = $this->procBuilder->getProcess();
         $process->run();
         if (!$process->isSuccessful()) {
-            throw new \Exception($process->getOutput());
+            throw new \Exception($process->getErrorOutput());
         } else {
-            return array('success'=>true, 'url'=>$process->getOutput());
+            return $process->getOutput();
         }
 
     }
diff --git a/config.example.yml b/config.example.yml
index 0734d4d..a9b905e 100644
--- a/config.example.yml
+++ b/config.example.yml
@@ -1,6 +1,9 @@
 youtubedl: vendor/rg3/youtube-dl/youtube_dl/__main__.py
 python: /usr/bin/python
-params: --no-playlist --no-warnings -f best
+params:
+    - --no-playlist
+    - --no-warnings
+    - -f best
 curl_params:
 convert: false
 avconv: vendor/bin/ffmpeg
diff --git a/controllers/FrontController.php b/controllers/FrontController.php
index 6e734cd..aba76f5 100644
--- a/controllers/FrontController.php
+++ b/controllers/FrontController.php
@@ -28,6 +28,11 @@ use Alltube\Config;
  * */
 class FrontController
 {
+    public function __construct()
+    {
+        $this->config = Config::getInstance();
+        $this->download = new VideoDownload();
+    }
 
     /**
      * Display index page
@@ -37,10 +42,9 @@ class FrontController
      *
      * @return void
      */
-    public static function index($request, $response)
+    public function index($request, $response)
     {
         global $container;
-        $config = Config::getInstance();
         $container->view->render(
             $response,
             'head.tpl',
@@ -56,7 +60,7 @@ class FrontController
             $response,
             'index.tpl',
             array(
-                'convert'=>$config->convert
+                'convert'=>$this->config->convert
             )
         );
         $container->view->render($response, 'footer.tpl');
@@ -70,7 +74,7 @@ class FrontController
      *
      * @return void
      */
-    public static function extractors($request, $response)
+    public function extractors($request, $response)
     {
         global $container;
         $container->view->render(
@@ -86,7 +90,7 @@ class FrontController
             $response,
             'extractors.tpl',
             array(
-                'extractors'=>VideoDownload::listExtractors()
+                'extractors'=>$this->download->listExtractors()
             )
         );
         $container->view->render($response, 'footer.tpl');
@@ -100,18 +104,18 @@ class FrontController
      *
      * @return void
      */
-    public static function video($request, $response)
+    public function video($request, $response)
     {
         global $container;
         $params = $request->getQueryParams();
-        $config = Config::getInstance();
+        $this->config = Config::getInstance();
         if (isset($params["url"])) {
             if (isset($params['audio'])) {
                 try {
-                    $video = VideoDownload::getJSON($params["url"]);
+                    $video = $this->download->getJSON($params["url"]);
 
                     //Vimeo needs a correct user-agent
-                    $UA = VideoDownload::getUA();
+                    $UA = $this->download->getUA();
                     ini_set(
                         'user_agent',
                         $UA
@@ -123,7 +127,7 @@ class FrontController
                             'Content-Disposition: attachment; filename="'.
                             html_entity_decode(
                                 pathinfo(
-                                    VideoDownload::getFilename(
+                                    $this->download->getFilename(
                                         $video->webpage_url
                                     ),
                                     PATHINFO_FILENAME
@@ -135,7 +139,7 @@ class FrontController
                         header("Content-Type: audio/mpeg");
                         passthru(
                             '/usr/bin/rtmpdump -q -r '.escapeshellarg($video->url).
-                            '   |  '.$config->avconv.
+                            '   |  '.$this->config->avconv.
                             ' -v quiet -i - -f mp3 -vn pipe:1'
                         );
                         exit;
@@ -145,7 +149,7 @@ class FrontController
                             'Content-Disposition: attachment; filename="'.
                             html_entity_decode(
                                 pathinfo(
-                                    VideoDownload::getFilename(
+                                    $this->download->getFilename(
                                         $video->webpage_url
                                     ),
                                     PATHINFO_FILENAME
@@ -156,10 +160,10 @@ class FrontController
                         );
                         header("Content-Type: audio/mpeg");
                         passthru(
-                            'curl '.$config->curl_params.
+                            'curl '.$this->config->curl_params.
                             ' --user-agent '.escapeshellarg($UA).
                             ' '.escapeshellarg($video->url).
-                            '   |  '.$config->avconv.
+                            '   |  '.$this->config->avconv.
                             ' -v quiet -i - -f mp3 -vn pipe:1'
                         );
                         exit;
@@ -169,7 +173,7 @@ class FrontController
                 }
             } else {
                 try {
-                    $video = VideoDownload::getJSON($params["url"]);
+                    $video = $this->download->getJSON($params["url"]);
                     $container->view->render(
                         $response,
                         'head.tpl',
@@ -217,14 +221,14 @@ class FrontController
      *
      * @return void
      */
-    public static function redirect($request, $response)
+    public function redirect($request, $response)
     {
         global $app;
         $params = $request->getQueryParams();
         if (isset($params["url"])) {
             try {
                 $format = isset($params["format"]) ? $params["format"] : 'best';
-                $video = VideoDownload::getJSON($params["url"], $format);
+                $video = $this->download->getJSON($params["url"], $format);
                 $client = new \GuzzleHttp\Client();
                 $stream = $client->request('GET', $video->url, array('stream'=>true));
                 $response = $response->withHeader('Content-Disposition', 'inline; filename="'.$video->_filename.'"');
@@ -249,13 +253,13 @@ class FrontController
      *
      * @return void
      */
-    public static function json($request, $response)
+    public function json($request, $response)
     {
         global $app;
         $params = $request->getQueryParams();
         if (isset($params["url"])) {
             try {
-                $video = VideoDownload::getJSON($params["url"]);
+                $video = $this->download->getJSON($params["url"]);
                 return $response->withJson($video);
             } catch (\Exception $e) {
                 return $response->withJson(
diff --git a/index.php b/index.php
index c26d743..de9387b 100644
--- a/index.php
+++ b/index.php
@@ -15,6 +15,7 @@
 require_once __DIR__.'/vendor/autoload.php';
 require_once __DIR__.'/vendor/rudloff/smarty-plugin-noscheme/modifier.noscheme.php';
 use Alltube\VideoDownload;
+use Alltube\Controller\FrontController;
 
 $app = new \Slim\App();
 $container = $app->getContainer();
@@ -28,24 +29,26 @@ $container['view'] = function ($c) {
     return $view;
 };
 
+$controller = new FrontController();
+
 $app->get(
     '/',
-    array('Alltube\Controller\FrontController', 'index')
+    array($controller, 'index')
 );
 $app->get(
     '/extractors',
-    array('Alltube\Controller\FrontController', 'extractors')
+    array($controller, 'extractors')
 )->setName('extractors');
 $app->get(
     '/video',
-    array('Alltube\Controller\FrontController', 'video')
+    array($controller, 'video')
 )->setName('video');
 $app->get(
     '/redirect',
-    array('Alltube\Controller\FrontController', 'redirect')
+    array($controller, 'redirect')
 )->setName('redirect');
 $app->get(
     '/json',
-    array('Alltube\Controller\FrontController', 'json')
+    array($controller, 'json')
 );
 $app->run();
diff --git a/tests/VideoDownloadTest.php b/tests/VideoDownloadTest.php
index 9f0c7b4..d137735 100644
--- a/tests/VideoDownloadTest.php
+++ b/tests/VideoDownloadTest.php
@@ -27,6 +27,11 @@ use Alltube\VideoDownload;
  * */
 class VideoDownloadTest extends \PHPUnit_Framework_TestCase
 {
+    protected function setUp()
+    {
+        $this->download = new VideoDownload();
+    }
+
     /**
      * Test getUA function
      *
@@ -34,7 +39,7 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testGetUA()
     {
-        $this->assertStringStartsWith('Mozilla/', VideoDownload::getUA());
+        $this->assertStringStartsWith('Mozilla/', $this->download->getUA());
     }
 
     /**
@@ -44,7 +49,7 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testListExtractors()
     {
-        $extractors = VideoDownload::listExtractors();
+        $extractors = $this->download->listExtractors();
         $this->assertContains('youtube', $extractors);
     }
 
@@ -57,11 +62,10 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      * @return       void
      * @dataProvider urlProvider
      */
-    public function testGetURL($url, $format)
+    public function testGetURL($url, $format, $filename, $domain)
     {
-        $videoURL = VideoDownload::getURL($url, $format);
-        $this->assertArrayHasKey('success', $videoURL);
-        $this->assertArrayHasKey('url', $videoURL);
+        $videoURL = $this->download->getURL($url, $format);
+        $this->assertContains($domain, $videoURL);
     }
 
     /**
@@ -75,7 +79,7 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testGetURLError($url)
     {
-        $videoURL = VideoDownload::getURL($url);
+        $this->download->getURL($url);
     }
 
     /**
@@ -88,16 +92,19 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
         return array(
             array(
                 'https://www.youtube.com/watch?v=M7IpKCZ47pU', null,
-                "It's Not Me, It's You - Hearts Under Fire-M7IpKCZ47pU.mp4"
+                "It's Not Me, It's You - Hearts Under Fire-M7IpKCZ47pU.mp4",
+                'googlevideo.com'
             ),
             array(
                 'https://www.youtube.com/watch?v=RJJ6FCAXvKg', 22,
                 "'Heart Attack' - Demi Lovato ".
-                "(Sam Tsui & Against The Current)-RJJ6FCAXvKg.mp4"
+                "(Sam Tsui & Against The Current)-RJJ6FCAXvKg.mp4",
+                'googlevideo.com'
             ),
             array(
                 'https://vimeo.com/24195442', null,
-                "Carving the Mountains-24195442.mp4"
+                "Carving the Mountains-24195442.mp4",
+                'vimeocdn.com'
             ),
         );
     }
@@ -126,7 +133,7 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testGetFilename($url, $format, $result)
     {
-        $filename = VideoDownload::getFilename($url, $format);
+        $filename = $this->download->getFilename($url, $format);
         $this->assertEquals($filename, $result);
     }
 
@@ -141,7 +148,7 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testGetJSON($url, $format)
     {
-        $info = VideoDownload::getJSON($url, $format);
+        $info = $this->download->getJSON($url, $format);
         $this->assertObjectHasAttribute('webpage_url', $info);
         $this->assertObjectHasAttribute('url', $info);
         $this->assertObjectHasAttribute('ext', $info);
@@ -161,6 +168,6 @@ class VideoDownloadTest extends \PHPUnit_Framework_TestCase
      */
     public function testGetJSONError($url)
     {
-        $videoURL = VideoDownload::getJSON($url);
+        $videoURL = $this->download->getJSON($url);
     }
 }