diff --git a/backgroundremover/utilities.py b/backgroundremover/utilities.py
index 52be205..e14159a 100644
--- a/backgroundremover/utilities.py
+++ b/backgroundremover/utilities.py
@@ -89,7 +89,7 @@ def matte_key(output, file_path,
         file_path
     ]
     framerate_output = sp.check_output(cmd, universal_newlines=True)
-    total_frames = int(framerate_output)
+    total_frames = int(framerate_output.replace(',', '').strip())
     if frame_limit != -1:
         total_frames = min(frame_limit, total_frames)