Update app.py

app.py

@@ -379,7 +379,7 @@ def propagate_to_all(video_in, checkpoint, stored_inference_state, stored_frame_
             show_white_mask(out_mask, ax)
     
         # Save the white mask figure to an image in memory
-        mask_filename = os.path.join(masks_output_dir, f"mask_{out_frame_idx}.jpg")
+        mask_filename = os.path.join(mask_frames_output_dir, f"mask_{out_frame_idx}.jpg")
         fig.savefig(mask_filename, format='jpg', bbox_inches="tight", pad_inches=0)
         plt.close(fig)