Can't play video with Extreme from NAS. Help.

Hi!

I have bought AirPort Extreme 2013 and now I can't play video on my Home Theater. (Can't play video. This video file is not supported).

Before I had ASUS RT-N66U router and video were played fine. The most of them. I mean *.avi, *.mkv and other codecs.

Video files are on LaCie 2big NAS. It connected to AirPort Extreme with ethernet cabe (1Gb). Home theater connected to AE router with WiFi. I can browse all the files on NAS, view photos but cant play any video now.

It plays video from USB stick, but cant play the same video from NAS with WiFi.

There no any setting on AirPort utility. What should I do? Whats wrong?