Playback Error - Client isn't compatible

[Daniel_King]

Hello,

I was finally able to set up my Jellyfin server (in Docker). At the beginning, it looked like everything is working fine, even the DLNA function, but it turned out that something was not working well.

For some files, when accessing them, I get an error:

Playback Error
This client isn't compatible with the media and the server isn't sending a compatible media format.

Most of these files are 50 - 80 GB and are MKVs.

When checking the internet, it looks like it could be some sort of codec issue, but I'm not sure how this can be the case because all these files are playing fine when played directly on the client.

I tested the files on my Android phone, Google TV and PC. No issue. Just when using Jellyfin, I get this error in the Jellyfin app and browser (Chrome & Firefox, Windows & Mac).

What I want is to be able to directly stream my files from the Jellyfin server to the client without transcoding/re-encoding to avoid any kind of quality loss. As all the clients are able to play the files directly, why should it be a problem when Jellyfin is involved?

Thanks