diff --git a/appinfo/info.xml b/appinfo/info.xml
index 9f4f1be..db28e4d 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -8,7 +8,7 @@ Search for torrents within the app from mutiple BT sites;
 Control Aria2 and manage download tasks from the web;
 download videos from 700+ video sites(youtube,youku,vimo,dailymotion,twitter,facebook and the likes
 </description>
-    <version>0.5.1</version>
+    <version>0.5.2</version>
     <licence>agpl</licence>
     <author mail="freefallbenson@gmail.com" homepage="https://github.com/shiningw">jiaxinhuang</author>
     <namespace>NCDownloader</namespace>
diff --git a/lib/Tools/Youtube.php b/lib/Tools/Youtube.php
index da5d1db..e8a9f60 100644
--- a/lib/Tools/Youtube.php
+++ b/lib/Tools/Youtube.php
@@ -15,7 +15,7 @@ class Youtube
     private $options = [];
     private $downloadDir;
     private $timeout = 60 * 60 * 10; //10 hours
-    private $outTpl = "/%(id)s-%(title)s.%(ext)s";
+    private $outTpl = "%(id)s-%(title)s.%(ext)s";
     private $defaultDir = "/tmp/downloads";
     private $env = [];
 
@@ -48,6 +48,12 @@ class Youtube
         $this->setEnv('LANG', $lang);
         $this->addOption("--no-mtime");
         $this->addOption('--ignore-errors');
+
+        if (($index = $this->hasOption('--output')) !== false) {
+            $this->outTpl = $this->options[$index + 1];
+            unset($this->options[$index]);
+            unset($this->options[$index + 1]);
+        }
     }
 
     public function setEnv($key, $val)
@@ -63,7 +69,9 @@ class Youtube
             $this->setOption('--metadata-from-title', "%(artist)s-%(title)s");
             $this->addOption('--extract-audio');
         }
-        $this->outTpl = "/%(id)s-%(title)s.m4a";
+        $pos = strrpos($this->outTpl, '.');
+        $this->outTpl = substr($this->outTpl, 0, $pos) . ".m4a";
+        //$this->outTpl = "/%(id)s-%(title)s.m4a";
         $this->setAudioFormat($this->audioFormat);
         return $this;
     }
@@ -140,11 +148,11 @@ class Youtube
         }
         $this->helper = YoutubeHelper::create();
         $this->downloadDir = $this->downloadDir ?? $this->defaultDir;
-        $this->setOption("--output", $this->downloadDir . $this->outTpl);
+        $this->setOption("--output", $this->downloadDir . "/" . $this->outTpl);
         $this->setUrl($url);
         $this->prependOption($this->bin);
+        //\OC::$server->getLogger()->error($process->getCommandLine(), ['app' => 'PHP']);
         $process = new Process($this->options, null, $this->env);
-        \OC::$server->getLogger()->error($process->getCommandLine(), ['app' => 'PHP']);
         $process->setTimeout($this->timeout);
         $process->run(function ($type, $buffer) use ($url) {
             if (Process::ERR === $type) {
@@ -192,7 +200,7 @@ class Youtube
     public function setOption($key, $value, $hyphens = false)
     {
         $this->addOption($key, $hyphens);
-        $this->addOption($value, $hyphens);
+        $this->addOption($value, false);
         return $this;
     }
     public function addOption(String $option, $hyphens = false)
@@ -203,6 +211,11 @@ class Youtube
         array_push($this->options, $option);
     }
 
+    protected function hasOption($name)
+    {
+        return array_search($name, $this->options);
+    }
+
     public function forceIPV4()
     {
         $this->addOption('force-ipv4', true);