Ffmpeg-python: The system can't find the specified file

[ghost]

I am having this error whe I try to use ffmpeg-python:
Traceback (most recent call last):
File "C:\Users\nicol\Desktop\ffmpegpy.py", line 6, in
.output('output.mp4')
File "C:\Program Files\Python36\lib\site-packages\ffmpeg_run.py", line 208, in run
p = subprocess.Popen(args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream)
File "C:\Program Files\Python36\lib\subprocess.py", line 709, in __init__
restore_signals, start_new_session)
File "C:\Program Files\Python36\lib\subprocess.py", line 997, in _execute_child
startupinfo)
FileNotFoundError: [WinError 2] El sistema no puede encontrar el archivo especificado
(The system can't find the specified file)
Any idea why isn't working?
Btw, there is the script that I try to run:

import ffmpeg
(
ffmpeg
.input('audiosurf.mp4')
.hflip()
.output('output.mp4')
.run()
)
I taked the code from the ffmepeg-python README.md

[bstojkovic]

I was getting the same error until I copied ffmpeg.exe into C:\Program Files (x86)\Python37-32. Is there a way without doing this?

[kkroening]

You have to make sure ffmpeg is installed and either on your PATH variable or tell ffmpeg-python where to find it, e.g.:

ffmpeg.run(stream, cmd='C:\\somewhere\\ffmpeg.exe')

[bstojkovic]

I put ffmpeg.exe in C:\ffmpeg. In system environment variable PATH, I added C:\ffmpeg, prior to posting my comment, but I was still getting the error.

I'm OK with specifying the path to ffmpeg however. Thank you for reply.