From the filename fragment, here are the likely of this release:
This is a specific implementation of the H.264/MPEG-4 AVC standard. x264 is open-source and known for excellent compression efficiency. At 1080p, a well-tuned x264 encode can look virtually indistinguishable from the source while reducing file size from ~25 GB (on disc) to anywhere between 6 GB and 12 GB, depending on settings. End.of.Days.1999.1080p.BluRay.x264.Dual.Audio.H...