: The video compression standard used (H.264/MPEG-4 AVC).
: Indicates a Standard Definition (SD) resolution (typically World.War.Z.2013.UNRATED.480p.BDRip.x264.450MB-...
The string provided appears to be a standardized filename for a digital copy of the 2013 film World War Z . Specifically, it refers to the of the movie. Technical Breakdown of the Filename : The video compression standard used (H