When you encounter players that don't do subs, HARDSUB can burn them into the video.
I've recently installed Samsung SmartView 2.0 on my PC to be able to watch movies installed on my computer on my 48" smart TV.
I've managed to watch video files but without the subtitles attached (.srt file). It seems I can only upload videos but not subtitle files. (Needless to say the movie works fine with the subtitles on my PC...)