maybe the topic title is not the best choice but I am confident there are many others who had / have the same issue - maybe there is a solution out there?
In brief: I can access shared files stored on a NAS (D-Link DNS-323) and I can play video files (.mkv) saved on the NAS, from smart TVs (a Panasonic and a Samsung) or a new Panasonic Freeview Recorder (DMR-HWT260) but I cannot get the .srt subtitles to work. All video files have .srt file associated. If I play the video files from a PC (using VLC) then the subtitles appear as expected. I tried to replace the .srt with various other types (.sub, .scc, .ass, .xml, .vtt, .rt, svb) with no result. It seems the subtitles cannot get through the DLNA protocol??
But: if the Panasonic recorder makes a tv recording of a show with subtitles, I can turn subtitles on/off when I play the recording - even if I play it from a different device (like the Panasonic TV in the sketch below). The Panasonic TV sees both the NAS and the Panasonic recorder as DLNA network servers and can browse through the available files and can play them - but I can only get access to the subtitles for the recorded tv shows in the freeview recorder, no access to the subtitles saved on the NAS from any of the three devices (1x recorder + 2x TVs).
Is there any chance that I will ever be able to get this to work?
Here is the configuration of the home network: