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Both libraries are developed in parallel, but libdvdnav is intended to support more sophisticated DVD features such as menus and multi-angle playback.
However, to compensate for the lack of expected GUI behavior, mpv will in some cases start with some settings changed to behave slightly more like a GUI mode.
Some options support passing values in a more structured way instead of flat strings, and can avoid the suboption parsing mess.
For example, to avoid the need for filename escaping.
Image subtitles are implemented as a bitmap video stream which can be superimposed over the main movie.
mpv's subtitle styling and positioning options and keyboard shortcuts generally do not work with image-based subtitles. For details and platform specifics (in particular Windows paths) see the FILES section.