diff --git a/src/FFMpeg/Media/Frame.php b/src/FFMpeg/Media/Frame.php
index 590deff..0544113 100644
--- a/src/FFMpeg/Media/Frame.php
+++ b/src/FFMpeg/Media/Frame.php
@@ -115,7 +115,10 @@ class Frame extends AbstractMediaType
             $commands = array_merge($commands, $filter->apply($this));
         }
 
-        $commands = array_merge($commands, array($pathfile));
+        // without output filename when return binary string
+        if(!$returnBase64) {
+            $commands = array_merge($commands, array($pathfile));
+        }
 
         try {
             if(!$returnBase64) {