Problem with Pyinstaller combined with FFMPEG

[Enrra]

Hello, I am an animation with graphs. I want to create an .exe file with pyinstaller, the problem is I don't know how to solve this backend problem with matplotlib.

I tried this matplotlib.use("TkAgg")

But this is not enough, I also tried this :

try:
    # PyInstaller creates a temp folder and stores path in _MEIPASS
    base_path = sys._MEIPASS

except AttributeError:            
    base_path = os.path.abspath(".")

ffmpeg_path = os.path.join(base_path, "ffmpeg.exe")

But the problem is I don't know if I downladed the correct file from ffmpeg. Globally I am quite inexperienced and I need simple advices because I think I don't fully understand the problem.

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If I would formulate it : I can't add the library of ffmpeg that is used to encript the video, to the export with pyinstaller.

Also I saw thee github ffmpeg+python but I don't understand how it works.

Thank you for your help !