Most DVDs and Bluray discs contain chapters to make skipping around a movie convenient. Usually, the author (studio) that produces the disc supplies a list of scenes and there is a chapter associated to the beginning of a scene. Most discs come with a built in menu that lets you skip to these scenes.
If you backup your movie into single file like mkv or mp4, you lose the menu. However, these formats support embedded chapter times and names. Usually, the times are easy to extract, and you end up with a list:
CHAPTER01=00:00:00.000 CHAPTER01NAME=Chapter 1 CHAPTER02=00:04:28.477 CHAPTER02NAME=Chapter 2 CHAPTER03=00:07:32.452 CHAPTER03NAME=Chapter 3 CHAPTER04=00:12:47.392 CHAPTER04NAME=Chapter 4 CHAPTER05=00:16:47.465 CHAPTER05NAME=Chapter 5
Unfortunately, these lists of chapters do not have any meaningful scene titles. That is where chapterdb.org saves the day. The community is building a list of scene titles that correspond to the chapter times extracted from the disc.
The API has been documented at docs.jarrettvance.apiary.io. You must supply your API key from your account page as a http header.