This feature is accessible by the "Tags" button in Mux tab :

This gives you to have some additional informations during the playback of your output file. However, all multimedia players cannot display these datas. Several players like Media Player Classic, iTunes or even Winamp should be able to display correctly these metadatas. An other thing : if you want to tag your file including chapters, the tool used for tags creation will delete them unfortunately. So, waiting a new way to do that, here are some hints :

- Title : referencing to the title sequences or title film.
- Author/Artist : to have Author's name or Artist's name.
- Album : concerning backup cd audio files, this is the Album name.
- Track# : for audios tracks too. This is the track number.
- Date : can't you guess ?...
- Genre : genre selection for film or music. There are already some presets. You can add what you want by editing one of the last items in the list.
- Comments : to add other comments.
- Picture : to specify the path of a movie picture or an album (only jpg or png) which will be integrate in your output file.