The video file is ts, not mp4 (check it in MediaInfo tool). You can remux the file (MKVToolNix). Otherwise try VLC 4 where the issue should already be fixed.
Great ! You found it... I am not a developper, just a user with basic knowledge. So when I see a file with a MP4 extension, I believe (Now no more !).
Several supposed "MP4" files in my computer were in fact TS files. And I tried with verified MP4 , it works...
Thank you very much mederi ! thank you also for others who tried to help me !
The issue is solved !