fix bug dump video enable

Author: JunchenLiu77

nerfview/render_panel.py

@@ -1036,7 +1036,7 @@ def _(_) -> None:
         render_tab_state.preview_render = False
         preview_save_camera_path_button.visible = True
         preview_render_stop_button.visible = False
-        dump_video_button.disabled = False
+        dump_video_button.disabled = not play_button.visible
 
         # Revert camera poses.
         with server.atomic():
@@ -1107,7 +1107,6 @@ def _(_) -> None:
     def _(_) -> None:
         play_button.visible = False
         pause_button.visible = True
-        prev_dump_video_disabled = dump_video_button.disabled
         dump_video_button.disabled = True
 
         def play() -> None:
@@ -1123,7 +1122,7 @@ def play() -> None:
         play_thread = threading.Thread(target=play)
         play_thread.start()
         play_thread.join()
-        dump_video_button.disabled = prev_dump_video_disabled
+        dump_video_button.disabled = not preview_save_camera_path_button.visible
 
     # Play the camera trajectory when the play button is pressed.
     @pause_button.on_click