OK so I have some news :
-From the network, I can read mp4 files but not mkv files
-From a usb stick, I can read mkv files. I dod not try mp4 but I assume it works J
-When I try to play mkv from the network, I have an error message : "Playback failed. One or more items failed to play. Check the log for more information about this message". But when I check the logs (information, basic, warning, error), I get nothing except "Kodi successul start"
Any idea ? There are integrated subtitles in the video (that can be enabled or disabled when I read it with VLC on windows), can it cause it to fail ?
-One other remark : it happens sometimes that Libreelec freezes a few seconds after it starts. Might be linked to the fact I try to use Yatse app from my android phone to control it. I don't know if there is a link...