Update ui.py

ui.py

@@ -145,7 +145,11 @@ def render_ui(process_video_func):
                 background = selected_color  # "#RRGGBB"
             # --- Process Button ---
             st.header("3. Process Video")
-            can_process = (uploaded_video is not None and not st.session_state.get('processing', False) and (background is not None))
+            can_process = (
+                uploaded_video is not None
+                and not st.session_state.get('processing', False)
+                and (background is not None)
+            )
             if st.button("Process Video", disabled=not can_process, use_container_width=True):
                 try:
                     logger.info("Process Video button clicked")
@@ -153,7 +157,7 @@ def render_ui(process_video_func):
                         st.error("Please upload a background image")
                         return
                     with st.spinner("Processing video..."):
-                        # NOTE: Always pass lowercased bg_type!
+                        # === FIX: Always pass lowercased bg_type as third argument ===
                         success = process_video_func(uploaded_video, background, bg_type.lower())
                     if success:
                         st.success("Video processing complete!")