Streaming on a raspberry pi

Hey guys,
I have a problem with infuse. Recently I started getting prompted to upgrade to pro, whenever I want to open a stream. I have a raspberry pi running, and stream mkv files via the sftp protocol. I can’t figure out what is only for premium users, is it the mkv file, is it the streaming part, what is happening? And more importantly why only now(I didn’t have any subscription or trial)? Any help is much appreciated

The most common reason for needing the pro version of Infuse is that the film/tv episode being played contains an AC3 soundtrack which is a Pro feature … Firecore have to pay a license fee to Dolby for this support which is why it is not available in the free version.

The features available in the Pro version are mentioned at the end of the app description in the App Store.