Can someone explain how to set this up? What does those values mean? Do I have to download trailers and tag them as trailers, or are they downloaded from YouTube or something? What about THX intro, DTS and those other fields? How do I set all of this up?
You need to have all the files in your library, nothing will be pulled from the internet. So, if you want to play a DTS trailer, that DTS trailer will need to be in your library. If you don't have any of these files and would like some, here is a good place to get you started
https://www.demo-world.eu/ They have both
Movie Trailers and
DTS/THX/Dolby/Etc intros.
Once you have the files in your library, there is a new field in MC called [Pre-Show] which is a convenient place to tag your media.
Lets say you download 15 movie trailers, 10 DTS intros, and 5 THX intros from the site above.
You would then populate the Pre-Show field for the trailers with the value "Movie Trailer", the DTS intros you'd tag with "DTS" and the THX intros with "THX"
Now lets say you want to show 3 random trailers, 1 DTS intro and 1 THX intro before your movie plays. You'd setup your preshow with the following values
3:[Pre-Show]=[Movie Trailer]
1:[Pre-Show]=[DTS]
1:[Pre-Show]=[THX]
That said, you actually don't need to use the Pre-Show field. The above simply a search. You can use any field you want, say want to play 3 files that have the Comment tag filled in with the value "Popcorn" you could add this to your Showtime settings.
3:[Comment]=[Popcorn]
That should get you started, come back if you have any questions.