4261 - Bolt - 2008 - Brrip - 1280x720.mkv.mp4 -

The most curious part of this filename is the double extension: .mkv.mp4 .

A versatile container that can hold multiple audio tracks (different languages) and subtitle files. 4261 - BOLT - 2008 - BRRip - 1280x720.mkv.mp4

A BDRip is encoded directly from a Blu-ray disc. A BRRip is a "re-encode"—meaning it was created from an already existing BDRip or a high-quality digital source. The most curious part of this filename is

This indicates the "High Definition" (HD) standard of the video. 4261 - BOLT - 2008 - BRRip - 1280x720.mkv.mp4