diff --git a/movie_util.py b/movie_util.py
index 4e50799..94aa223 100644
--- a/movie_util.py
+++ b/movie_util.py
@@ -68,7 +68,8 @@ class MovieSaver():
             silent_ffmpeg: bool
                 Surpress the output from ffmpeg.
         """
-        assert os.path.isdir(os.path.split(fp_out)[0]), "Directory does not exist!"
+        if len(os.path.split(fp_out)[0]) > 0:
+            assert os.path.isdir(os.path.split(fp_out)[0]), "Directory does not exist!"
         
         self.fp_out = fp_out
         self.fps = fps