MKV Chapterizer Portable can add chapters to your MKV video file. The only thing you need to do is drop your MKV file onto the program, choose how often you want a chapter to be created and then press Chapterize. Or if you want a little more class you can choose a set of chapters from ChapterDB which contains human-made chapter times and sometimes even the real chapter names. It features fetching and using of chapters from ChapterDB, chapterizing using external file, de-chapterizing, choosable chapter interval from 1 second to 60 hours. Amd ability to only output/extract chapter files.