code: def available():
      """Detect whether the FFmpeg backend can be used on this system."""
      try:
          proc = popen_multiple(
              COMMANDS,
              ["-version"],
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
              creationflags=PROC_FLAGS,
          )
      except OSError:
          return False
      else:
          proc.communicate()
          return proc.returncode == 0
  
imports: import queue
  import re
  import subprocess
  import sys
  import threading
  import time
  from io import DEFAULT_BUFFER_SIZE
  from .exceptions import DecodeError
  from .base import AudioFile
label_desc: Use image node_id 2 for calling a global function with example usage: available() and returns: unknown, False