code: def return_testvideo_path(fmt="av"):
      """
      returns Test video path
      """
      supported_fmts = {
          "av": "BigBuckBunny_4sec.mp4",
          "vo": "BigBuckBunny_4sec_VO.mp4",
          "ao": "BigBuckBunny_4sec_AO.aac",
      }
      req_fmt = fmt if (fmt in supported_fmts) else "av"
      path = "{}/Downloads/Test_videos/{}".format(
          tempfile.gettempdir(), supported_fmts[req_fmt]
      )
      return os.path.abspath(path)
  
imports: import os
  import cv2
  import queue
  import pytest
  import m3u8
  import logging
  import platform
  import tempfile
  from mpegdash.parser import MPEGDASHParser
  from vidgear.gears import CamGear, StreamGear
  from vidgear.gears.helper import logger_handler, validate_video
label_desc: Use image node_id 1 for calling a global function with example usage: return_testvideo_path(fmt) and returns: os