diff --git a/src/Stream.php b/src/Stream.php
index e8957e2..412d823 100644
--- a/src/Stream.php
+++ b/src/Stream.php
@@ -2,7 +2,11 @@
 
 namespace Danjones\FFMpeg;
 
+use FFMpeg\Format\AudioInterface;
 use FFMpeg\Format\FormatInterface;
+use FFMpeg\Format\ProgressListener\AbstractProgressListener;
+use FFMpeg\Format\ProgressableInterface;
+use FFMpeg\Format\VideoInterface;
 
 class Stream
 {
@@ -39,10 +43,77 @@ class Stream
         return $this;
     }
 
+    // @todo add hlper methods for setting codec
+
+    public function getCodec(): FormatInterface
+    {
+        return $this->codec;
+    }
+
+    public function editCodec(callable $callback): static
+    {
+        $callback($this->codec);
+
+        return $this;
+    }
+
     protected function parseCodec(): static
     {
-        // @todo
-        $this->addFlag('c', 'libx265');
+        if ($this->codec instanceof VideoInterface) {
+            return $this->parseVideo();
+        }
+
+        if ($this->codec instanceof AudioInterface) {
+            return $this->parseAudio();
+        }
+
+        // @todo add subtitles
+
+        $this->addFlag('c', 'copy');
+
+        return $this;
+    }
+
+    protected function parseAudio(): static
+    {
+        if (null !== ($codec = $format->getAudioCodec())) {
+            $this->addFlag('c', $codec);
+        }
+
+        if (null !== ($kb = $format->getAudioKiloBitrate())) {
+            $this->addFlag('b', "{$kb}k");
+        }
+
+        if (null !== ($channels = $format->getAudioChannels())) {
+            $this->addFlag('ac', $channels);
+        }
+
+        return $this;
+    }
+
+    protected function parseVideo(): static
+    {
+        if (null !== ($codec = $format->getVideoCodec())) {
+            $this->addFlag('c', $codec);
+        }
+
+        if (0 !== ($kb = $format->getKiloBitrate())) {
+            $this->addFlag('b', "{$kb}k");
+        }
+
+        // If the user passed some additional format parameters.
+        if (null !== ($params = $format->getAdditionalParameters())) {
+            reset($params);
+            while(null !== key($params)) {
+                $key = current($params);
+                $value = next($params);
+                if (null == key($params)) {
+                    continue;
+                }
+
+                $this->addFlag(ltrim($key, '-k'), $value);
+            }
+        }
 
         return $this;
     }