docstr: Format-specific metadata.
  
  .. warning::
      OpenCV does not support reading metadata. When called, this function
      will raise a ``NotImplementedError``.
  
  Parameters
  ----------
  index : int
      This parameter has no effect.
  exclude_applied : bool
      This parameter has no effect.
docstr_tok: ["Format-specific","metadata",".","..","warning",":",":","OpenCV","does","not","support","reading","metadata",".","When","called",",","this","function","will","raise","a","``","NotImplementedError","``",".","Parameters","--","--","--","--","--","index",":","int","This","parameter","has","no","effect",".","exclude_applied",":","bool","This","parameter","has","no","effect","."]
code: def metadata(
      self, index: int = None, exclude_applied: bool = True
  ) -> Dict[str, Any]:
      """Format-specific metadata.
  
      .. warning::
          OpenCV does not support reading metadata. When called, this function
          will raise a ``NotImplementedError``.
  
      Parameters
      ----------
      index : int
          This parameter has no effect.
      exclude_applied : bool
          This parameter has no effect.
  
      """
  
      warnings.warn(
          "OpenCV does not support reading metadata.", UserWarning
      )
      return dict()
  
file_path: imageio/imageio/plugins/opencv.py
imports: import warnings
  from pathlib import Path
  from typing import Any, Dict, List, Optional, Union
  import cv2
  import numpy
  from ..core import Request
  from ..core.request import URI_BYTES, InitializationError, IOMode
  from ..core.v3_plugin_api import ImageProperties, PluginV3
  from ..typing import ArrayLike
label_desc: Use image node_id 6 for calling the OpenCVPlugin obj's underlying member method code with example usage: obj.metadata(index, exclude_applied) and returns: dict