extract class names from my data set ?

[sebyo]

I want to use the same work that you have done but on another dataset (the MSR Daily 3d dataset)
the problem is I did'nt know how to extract the classe name and save them into a file text because de dataset is organised as this :

-video
-MSRDailyAct3D_pack1
-a01_s01_e01_rgb.avi
-a01_s01_e02_rgb.avi ........
.
.
-MSRDailyAct3D_pack8
so for every pack two actions are performed exemple pack1 (eat and drink)
I really need some help if you could sugget what should I do to generate class names for my dataset ?