do I need any 3rd party addons or is it all done internally, as I am thinking of converting all my rips to MKV.
I've never had any problem including subs using MakeMKV, or adding text subs (e.g., SRT) to MKV files using MKVmerge.
If I did this I would want to merge 2 disc films (where the film is actually spread across 2 films) so is MKVMerge still the best to use?
I'm sure MakeMKV could only create a MKV for each disc, but those can be combined using MKVmerge.
Dunno, sounds a lot like this thread here.
No, that's about representing and playing multiple videos (e.g., a movie series) as one—
without merging merging them into one file.
I should add that i'm talking about forced subtitles.
If applicable forced subs exist, MC will use them.