Hi glisoni,
when dealing with mkv having subs, AVStoDVD prompts an small option window showing the selectable subs. BUT following conditions must be fulfilled:
- source file is a matroska container
- vobsub/UTF-8 subs tracks are present
- 'mkvextract.exe' file is detected in the system (path is taken from reg key 'HKLM\SOFTWARE\mkvmergeGUI\GUI\installation_path')
Do you get that subs option window?
Bye