You can find some technical documentation here which might be helpfull to you.

• If you encounter problems try the FAQ, which can can be found here
• There is a description of the dvdauthor XML class available. So you can incorporate a dvdauthor xml-file-reader in your application
• Here is a description on how to port 'Q' DVD-Author to your language
• Here is a description on how to run 'Q' DVD-Author on Mac OS-X
• Following are examples on how to incorporate the media backends into your application.
  
  • This document describes how to incorporate QXineWidget.
  • This document describes how to incorporate KXineWidget.
  • This document describes how to incorporate QMPlayerWidget.
• JavaScript TreeView widgets. In case you like the treeview on the left, you can get the source Here.