Okay, I actually can do this through a funny workaround but I want to know if there is a more elegant way of doing this.
So I have a large movie collection and the movies have the general format as following.
D:\Movies 1\Chaos Theory\Chaos.Theory.(2008).1080p.BluRay.x264-PFa.mkv
For reasons of convenience I want to change all the subfolders in Movies 1 to the filename with either a .mkv or .avi extension.
My current method is by using this forum thread
along with a modified cmd line command as follows for easier list reductions.
C:\Users\HTPC>dir "D:\Movies 1" /b /s /a-d | findstr /ei ".avi$ .mkv$" > "D:Movies 1\Filenames.txt"
then I just follow the instructions in the forum. It works but I want to know if Bulk Rename Utility can do this on its own?