diff --git a/getPreview.php b/getPreview.php
index 74e39a1..3c2d32f 100644
--- a/getPreview.php
+++ b/getPreview.php
@@ -99,7 +99,7 @@ while(true)
     file_put_contents($imageFileName, file_get_contents($previewURL, false, $globalData['sslContext']));
     echo "done\n";
 
-    system("ffmpeg -f image2 -framerate 2 -i /data/images/%07d.jpg -r 25 -vcodec libx264 /data/images/video.mp4");
+    system("ffmpeg -f image2 -framerate 2 -i /data/images/%07d.jpg -r 25 -vcodec libx264 -y /data/images/video.mp4");
     sleep(300);
 }