Generate thumbnails for dataset items so things load faster and the ui is more stable. Especially good for videos.

extensions_built_in/captioner/BaseCaptioner.py

@@ -163,7 +163,8 @@ class BaseCaptioner(BaseExtensionProcess):
     def find_files(self):
         # recursivly find all the files in the path_to_caption with the specified extensions and save the paths to self.file_paths
         for root, dirs, files in os.walk(self.caption_config.path_to_caption):
-            dirs[:] = [d for d in dirs if d != "_controls"]
+            # skip _controls and hidden dirs (.thumbs, .tmp)
+            dirs[:] = [d for d in dirs if d != "_controls" and not d.startswith(".")]
             for file in files:
                 if any(
                     file.lower().endswith(f".{ext}") and not file.startswith(".")