diff --git a/src/FFMpeg/Format/Video/WebM.php b/src/FFMpeg/Format/Video/WebM.php
index c703eb6..59bab20 100644
--- a/src/FFMpeg/Format/Video/WebM.php
+++ b/src/FFMpeg/Format/Video/WebM.php
@@ -44,7 +44,7 @@ class WebM extends DefaultVideo
      */
     public function getAvailableAudioCodecs()
     {
-        return array('libvorbis');
+        return array('copy', 'libvorbis');
     }
 
     /**
diff --git a/src/FFMpeg/Format/Video/X264.php b/src/FFMpeg/Format/Video/X264.php
index a2c4acb..5496859 100644
--- a/src/FFMpeg/Format/Video/X264.php
+++ b/src/FFMpeg/Format/Video/X264.php
@@ -54,7 +54,7 @@ class X264 extends DefaultVideo
      */
     public function getAvailableAudioCodecs()
     {
-        return array('aac', 'libvo_aacenc', 'libfaac', 'libmp3lame', 'libfdk_aac');
+        return array('copy', 'aac', 'libvo_aacenc', 'libfaac', 'libmp3lame', 'libfdk_aac');
     }
 
     /**