This profile tells Plex to not do any conversions. It works best for the files I use to play - no quality loss and the TV can play them without problems.
AlbumArtPN
setting makes the thumbnails for movies and TV shows episodes work - I haven't yet found a way to display thumbnails for whole TV shows.
To use subtitles, I usually put them into one mkv together with the movie and the TV can then play them natively.
On OS X, put it into ~/Library/Application Support/Plex Media Server/Profiles
Profiles
directory needs to be created on fresh Plex installation.