I'm using MiniDLNA 1.0.24 (not .25 because it's not available in Ubuntu and OpenWRT) and most of my DLNA clients don't show non-embedded subtitles (.srt).
The name of the video and subtitle files are: a.avi and a.srt.
I have tested with 4 DLNA client with the following result:
- Skifta android app 1.57.07 - .srt does NOT show
- VLC 2.0.5 - .srt does NOT show
- Philips HMP7001/12 media player - .srt does NOT show
- LG LW650S television - .srt DOES show