diff --git a/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php b/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
index 2f61101..6133396 100644
--- a/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
+++ b/src/FFMpeg/Filters/Video/ExtractMultipleFramesFilter.php
@@ -24,9 +24,9 @@ class ExtractMultipleFramesFilter implements VideoFilterInterface
     /** will extract a frame every 10 seconds */
     const FRAMERATE_EVERY_10SEC = '1/10';
     /** will extract a frame every 30 seconds */
-    const FRAMERATE_EVERY_10SEC = '1/30';
+    const FRAMERATE_EVERY_30SEC = '1/30';
     /** will extract a frame every minute */
-    const FRAMERATE_EVERY_10SEC = '1/60';
+    const FRAMERATE_EVERY_60SEC = '1/60';
 
     /** @var integer */
     private $priority;