AVT ChapterIt is a powerful tool to add and edit chapters of video files. Those chapters work with most of the Players under Mac OSX as well with iOS-Devices, like iPad or iPhone.
You can manually add, edit or remove chapters or use the built-in functions to automatically add chapters.
Supported Video file types:
QuickTime movies (mov)
MPEG4-movies (mp4, m4v)
Matroska (mkv)
Import chapters from:
TEXT or XML files, including FCPXML
QuickTime, MPEG4 or Matroska videos
DVD (.ifo files)