[Python] Python ffmpeg won't accept path, why?

everytime i launch the code and set the correct path it gives me this error, I tried including ffmpeg path, uninstalling and installing the library back but no luck. I've also tried using diffrent ways to set the path like putting it directly without saving it to a variable, this is getting me crazy please help me with a solution .


Code


from pytube import *
import ffmpeg

global str
userurl = (input("Enter a youtube video URL : "))
q = str(input("Which quality you want ? 360p,480p,720p,1080p,4K,Flh :")).lower()
yt = YouTube(userurl)
print ("Title of the video : ",yt.title)


def hd1080p():
print("Downloading a HD 1080p video...")
v = yt.streams.filter(mime_type="video/mp4", res="1080p", adaptive = True).first().download(filename = "HD1080P.mp4")
print("Video downloaded")
yt.streams.filter(mime_type="audio")
a = yt.streams.get_audio_only()
print("Downloading audio")
a.download(filename = "audio.mp4")
print("audio downloaded")
input_video = ffmpeg.input("HD1080P.mp4")
added_audio = ffmpeg.input("audio.mp4").audio.filter('adelay', "1500|1500")

merged_audio = ffmpeg.filter([input_video.audio, added_audio], 'amix')

(
ffmpeg
.concat(input_video, merged_audio, v=1, a=1)
.output("mix_delayed_audio.mp4")
.run(overwrite_output=True)
)


if q == "1080" or q == "1080p":
hd1080p()
elif q == "720" or q == "720p":
hd720p()
elif q == "480" or q == "480p":
l480p()
elif q == "360" or q == "360p":
l360p()
elif q == "4" or q == "4k":
hd4k()
else:
print("invalid choice")


THE ERROR


Traceback (most recent call last):
File "c:\Users\messa\Desktop\upcoming project\videodownloader.py", line 65, in <module>
hd1080p()
File "c:\Users\messa\Desktop\upcoming project\videodownloader.py", line 26, in hd1080p
ffmpeg
File "E:\Users\messa\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 313, in run
process = run_async(
File "E:\Users\messa\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 284, in run_async
return subprocess.Popen(
File "E:\Users\messa\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 947, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "E:\Users\messa\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 1416, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

Continue reading...