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.
Given the low-power, hence performance-restricting, nature of the BRIX setup, playback of full-HD media on Gigabyte's mini system was perfectly smooth. CPU loads that rendered the rest of the system unusable were not exhibited, either.