code: def get_ffmpeg_pids():
      pids = set()
      for p in psutil.process_iter():
          if "ffmpeg" in p.name().lower():
              pids.add(p.pid)
      return pids
  
imports: import gc
  import os
  import platform
  import sys
  import threading
  import time
  import warnings
  from io import BytesIO
  from pathlib import Path
  import imageio.plugins
  import imageio.v2
  import imageio.v3
  import numpy
  import pytest
  from imageio import core
  from imageio.core import IS_PYPY
  from conftest import deprecated_test
label_desc: Use image node_id 1 for calling a global function with example usage: get_ffmpeg_pids() and returns: pids