Comentário oficial
Ummm... all tracks you add to the collection can be automatically analysed. You don't need to "mark" anything. Have you enabled that in your preferences? Or have you possibly disabled the automatic analysis?
There is no built-in file check because there are so many different file types (audio and video) and codec combinations that it would be far too time consuming to have that kind of tool running automatically.
You could colour-tag the tracks yourself, or even use the MyTag feature for that!