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My mistake.

The Sony BDP-S580 do not render separate *.srt files.
What I saw, was subtitles muxed into the *.mkv container. Not the separate *.srt file.

Sorry for the confusion.

I have a Sony BDP-S580. From USB source, it renders srt to mkv and avi containers.

Playing mkv movies with srt subtitles off the Serviio DLNA software server works for me - se the Sony BDP in...