Subtitles doesn't appear
I checked one of the example projects (DropIn-Player) and tried to enable subtitles(on different types of video) and they just don't appear. I switched the way VLCKit is used in project, from another project in workspace to CocoaPods(pod 'MobileVLCKit', '3.0.2') and subtitles works without any other changes in project.
So it seems that subtitles only works for project with CocoaPods