code: def extract(video, tmpl="%06d.jpg"):
      cmd = 'ffmpeg -i "{}/{}" -threads 1 -vf scale=-1:256 -q:v 0 "{}/{}/%06d.jpg"'.format(
          args.video_root, video, args.frame_root, video[:-5]
      )
      os.system(cmd)
  
file_path: gluon-cv/scripts/datasets/somethingsomethingv2.py
imports: import os
  import sys
  import threading
  import argparse
  import json
label_desc: Use image node_id 3 for calling a global function with example usage: extract(video, tmpl) without return types