docstr: If video does not exist, loop to the next one.
docstr_tok: ["If","video","does","not","exist",",","loop","to","the","next","one","."]
code: def _get_video(self, index):
      """
      If video does not exist, loop to the next one.
      """
      max_retries = 3
      for _ in range(max_retries):
          ann = self.annotation[index]
          video_path = os.path.join(
              self.vis_root, f"{ann['videoid']}.mp4"
          )
          try:
              video = self.vis_processor(video_path)
              return video, video_path, ann
          except:
              index = (index + 1) % len(
                  self.annotation
              )  # Safely loop back to start of annotations
      return None
  
imports: import os
  import math
  from lavis.datasets.datasets.base_dataset import BaseDataset
  from lavis.datasets.datasets.caption_datasets import CaptionDataset
label_desc: Use image node_id 2 for calling the WebVideoCaptionDataset obj's underlying member method code with example usage: obj._get_video(index) and returns: None, video,  video_path,  ann