diff --git a/src/Filters/HLSFilter.php b/src/Filters/HLSFilter.php
index f08cdfc..1224f10 100644
--- a/src/Filters/HLSFilter.php
+++ b/src/Filters/HLSFilter.php
@@ -82,7 +82,7 @@ private function getKeyInfo(): array
      */
     private function getInitFilename(Representation $rep): string
     {
-        return $this->seg_sub_dir . $this->filename . "_" . $rep->getHeight() ."p_". $this->hls->getHlsFmp4InitFilename();
+        return $this->seg_sub_dir . $this->filename . "_" . $rep->getHeight() . "p_" . $this->hls->getHlsFmp4InitFilename();
     }
 
     /**
@@ -91,7 +91,7 @@ private function getInitFilename(Representation $rep): string
      */
     private function getSegmentFilename(Representation $rep): string
     {
-        $ext = ($this->hls->getHlsSegmentType() === "fmp4") ? "m4s" : "ts";
+        $ext = ($this->hls->getHlsSegmentType() === "fmp4") ? "m4s" : $rep->getHlsSegmentExtension();
         return $this->seg_filename . "_" . $rep->getHeight() . "p_%04d." . $ext;
     }
 
@@ -102,6 +102,8 @@ private function getSegmentFilename(Representation $rep): string
     private function initArgs(Representation $rep): array
     {
         $init = [
+            "preset"                    => $rep->getPereset(),
+            "crf"                       => $rep->getCRF(),
             "hls_list_size"             => $this->hls->getHlsListSize(),
             "hls_time"                  => $this->hls->getHlsTime(),
             "hls_allow_cache"           => (int)$this->hls->isHlsAllowCache(),
@@ -109,14 +111,16 @@ private function initArgs(Representation $rep): array
             "hls_fmp4_init_filename"    => $this->getInitFilename($rep),
             "hls_segment_filename"      => $this->getSegmentFilename($rep),
             "s:v"                       => $rep->size2string(),
-            "b:v"                       => $rep->getKiloBitrate() . "k"
+            "b:v"                       => $rep->getKiloBitrate() . "k",
         ];
 
-        return array_merge($init,
+        return array_merge(
+            $init,
             $this->getAudioBitrate($rep),
             $this->getBaseURL(),
             $this->flags(),
-            $this->getKeyInfo());
+            $this->getKeyInfo()
+        );
     }
 
     /**
@@ -175,4 +179,4 @@ public function streamFilter(StreamInterface $stream): void
             $this->getArgs($rep, $reps->end() !== $rep);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Representation.php b/src/Representation.php
index 1b45969..5aa8086 100644
--- a/src/Representation.php
+++ b/src/Representation.php
@@ -29,6 +29,12 @@ class Representation implements RepresentationInterface
     /** @var array $hls_stream_info hls stream info */
     private $hls_stream_info = [];
 
+    private $hls_segment_extension = 'ts';
+
+    private $preset = 'medium';
+
+    private $crf = 23;
+
     /**
      * @return string | null
      */
@@ -154,4 +160,37 @@ public function getSize(): Dimension
     {
         return $this->size;
     }
-}
\ No newline at end of file
+
+    public function setHlsSegmentExtension(String $extension)
+    {
+        $this->hls_segment_extension = $extension;
+        return $this;
+    }
+
+    public function getHlsSegmentExtension()
+    {
+        return $this->hls_segment_extension;
+    }
+
+    public function setPreset($preset)
+    {
+        $this->preset = $preset;
+        return $this;
+    }
+
+    public function getPereset()
+    {
+        return $this->preset;
+    }
+
+    public function setCRF(Int $crf)
+    {
+        $this->crf = $crf;
+        return $this;
+    }
+
+    public function getCRF()
+    {
+        return $this->crf;
+    }
+}