class_docstr: Handles video datasets where subclip of full video needs to be loaded. 
class_docstr_tok: ["Handles","video","datasets","where","subclip","of","full","video","needs","to","be","loaded","."]
code: def __getitem__(self, index):
      ann = self.annotation[index]
  
      vname = ann["video_path"]
      video_path = os.path.join(self.vis_root, vname)
      try:
          video = self.vis_processor(
              video_path,
              start_sec=math.floor(ann["ts"][0]),
              end_sec=math.ceil(ann["ts"][1]),
          )
      except:
          return None
  
      caption = ann["caption"] if "caption" in ann else ann["query"]
  
      image_id = (
          ann["youtube_id"]
          if "youtube_id" in ann
          else ann["video_id"]
          if "video_id" in ann
          else vname
      )
  
      # "image_id" is kept to stay compatible with the COCO evaluation format
      return {
          "video": video,
          "text_input": self.text_processor(caption),
          "image_id": image_id,
          "instance_id": ann["instance_id"],
      }
  
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 ClipCaptionDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: dict, None