: This usually means that the video is a "light" version of a high-definition (HD) rip, indicating it might be a bit smaller in file size than a full HD rip but still offers good quality.
The codec is the successor to H.264. It uses advanced compression algorithms to analyze video frames more efficiently.
It is worth noting an interesting technical quirk: the official BBC Blu-ray of Sherlock Season 2 is actually mastered in due to the UK's broadcasting standards. A "1080p" encode like this one has likely been de-interlaced by the release group to be compatible with a wider range of media players, especially computers and tablets. Sherlock.S02.MULTi.1080p.BluRay.HDLight.x265-H4S5S
H4S5S Source: BluRay
For fans looking to rewatch this masterpiece in the best possible quality without sacrificing hard drive space, the release is a premier choice. : This usually means that the video is
Introduces Irene Adler, challenging Sherlock's intellect and emotions.
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This signifies that the video stream has been re-encoded from the raw Blu-ray to reduce file size while maintaining high perceived quality (often referred to as a "light" version of a full Blu-ray rip).
: The video encoding codec used (HEVC / High Efficiency Video Coding). This is the successor to the older H.264 standard. It is worth noting an interesting technical quirk:
Traditional 1080p Blu-ray rips utilizing older H.264 (x264) compression often yield massive file sizes ranging from 4GB to over 10GB per episode. For a complete series, this quickly consumes vast amounts of hard drive space.