Universal Media Server | Forum

This can be done only at the renderer side or specify it in the subs file. The UMS only send the subs file as it is.

Because you do not send the log I only guess that your renderer does not support embedded subtitles and the video is transcoded and font size, color etc. is working. If external subs are not supported by renderer than the video is transcoded too and the font size is working. Seems like your renderer supports external subtitles and the result is like I wrote before.

The log is almost useless. It is not made in the TRACE mode. Please read the Forum rules written in red above and follow the instructions. What was usefull from your log is that you do not set the shared folders. The UMS is scanning all your "/home/slobodan" folder and its subfolders not only folders with media. There are thousand not media files the UMS tries to monitor for changes but it makes an error

I edited my last post in the time you wrote your answer. Please remove the "/home/slobodan" folder from the shared folders and for the testing disable the "Scan shared folders on startup". It makes the log full of not usefull information. And try to play the video with subtitles which does not work for you. Than send the log.

EDIT: I also find the wrong setting for "audio/subtitles" languages. You have but it should be .
Also your TV is not properly recognized.

I see the problem. You have to enable "Use font settings (size, color..)" at the FFMpeg Video setting page or set in the UMS.conf .