The Matroska Media container is a very popular, open standard multimedia container which is usually found as .MKV files. It is a very popular format in enthusiast circles and can be played directly in VLC or Windows Media Player with suitable codecs installed.
We played our 1080P MKV rip of The Dark Knight using the latest version of VLC Media Player.
Media playback requires less CPU usage from the ASRock Z87 Extreme9/ac motherboard than it does on MSI's Z87 XPower. This is likely related to the additional CPU usage of background processes such as the Killer E2205 NIC's software on the Z87 XPower.