Rendering issue - offset between the preview and the final rendering

Hello,

I am writing to you about a problem that persists in rendering and moreover, on different computers (the first is a desktop and the second a laptop).

Before I begin, here are the references of the computer I use most often:

(HP ProBook 450 ; Windows 10 Proffesionnel ; Intel(R) Core(TM) i3 71000 ; @2.40 GHz)

When I work on the software, my hands (video file) are perfectly synchronised with the notes (MIDI File). Once the download (rendering) is finished (longer than usual), my hands have about a 2 seconds delay on the MIDI file.

I tried almost every possible solutions (move from "AVpro" to "Basic", check the frames, lower the quality of the final video rendering,...). Nothing helps.

I also re-installed the software, trying to export under different versions (including 3.8) ...

The offset being systematically the same on the final file, whatever happens and whatever the pre-defined settings.

Notes :

- My video is in 60 fps

- I recorded the MIDI file from SeeMusic as I usually do

- I use the audio from the midi rendering and put off the audio from my original video

Here are two videos, one before and one after the final rendering :

Thank you for your time,

if you have a few more minutes to give me, can you explain to me how to display this "shadow" effect on the keyboard that I can't reproduce (despite having viewed all your tutorials) Thank you :D

Have a good day :D