corrigir cancelamento de processo para windows 11

[hadtrindade]

Traceback (most recent call last):
File "C:\Users\ivo_h\AppData\Local\Programs\Python\Python310\lib\site-packages\conversor_divisor\app.py", line 133, in stop_process
_ = Popen(['tskill', 'ffmpeg'], stdout=DEVNULL, stderr=DEVNULL)
File "C:\Users\ivo_h\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 969, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "C:\Users\ivo_h\AppData\Local\Programs\Python\Python310\lib\subprocess.py", line 1438, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] O sistema não pode encontrar o arquivo especificado