The request was to play through LE-Kodi from another source, to see if the issue coming from jellyfin server or "non standard" media file. Another source with another media player doesn't help in that situation.
Different players (Kodi built-in player, VNC player...) handle different those "non-standard" media files.
A question could be: the player need to be able to play a "messed up mp4 container" or that is a media file issue instead player?
Oh I see.
I'll point kodi directly to the smb share and try it that way.