videos (including DVDs) and subtitles are inserted by drag and drop, you can also use CTRL + V
whole folders with videos can be inserted, application will filtrate videos and subtitles from it automaticaly; if you want to rip a dvd just insert dvd drive icon or folder when the dvd is located, or any file which is in that folder (.vob,.ifo,.bup)
subtitles are searched automatically if they are named same as video
support for more video tracks and subtitles which are directly in video (usualy .ogm, .mkv, .avi or DVD uses this)