Changes

* (+) textual captions can be accessed as a textual representation of the video and used for purposes that go beyond the on-screen display, e.g. for display as braille or search purposes

* (+) textual captions can be internationalised and given in multiple languages

* (-) textual captions contain essentially the represented spoken content together with music description, sound effect description, and metadata like the speaker name together in one representation means, which makes them semantically difficult to distinguish

* (-) being extra data that accompanies a video or audio file, a player needs to be specifically adapted to support display and handling of this kind of data