LG playing movies on USB, but not through DNLA

[indepther]

I have an LG 47LA660S for sometime now. Never managed to connect it with the PC, through DNLA. So, I was watching movies, by transfering them to a usb and then connecting it to the tv. Recently, I changed the router and connected an external drive to it. I managed to access it, through DNLA, from tv, but when I try to play the movies, it says "file not supported". The same files that I play through the usb stick. What is going on here? How it can play the same files from the usb stick and not through DLNA from the external hard drive.

 

Any input, will be much appreciated and sorry for the english (just realized that I am writting in english... dooghh)