During the design of the MediaPlayer we didn't take this case into consideration. The progressbar is designed to perform media navigation based on the whole movie length. Also the chapters are intended to be only marks on certain places not whole ranges inside the media. So the previous chapter will end when the next chapter is reached. Actually there is only logic triggered when a new chapter is reached that performs the changed of appropriate visuals.
The best approach would be to cut the movies in parts. I think this in fact is the scenario you are describing.
I'm not quite sure is you want to display all the chapters or only the currently playing one. If you want to display all the chapters then you should try to modify the control template of the MediaPlayerWrapper to display the time you want using a converter. Also the chapter control template may be changed to simulate the range overlapping behaviour.
If you want to show only the current chapter then you should also add controls to support navigation between chapters.
All the best,
the Telerik team
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