For an "HDLight" release like this one, x265 makes it possible to shrink a massive 1080p Blu-ray file down to a fraction of its original size (often under 1 GB per episode) without causing severe pixelation or artifacting. How to Properly Play and Decode x265 Multi-Audio Files
The inclusion of hdlight and x265 is the most technically significant part of the filename. A standard 1080p Blu-ray can easily be 30-40 GB. An uncompressed "remux" of that disc is a faithful copy, but unwieldy for many users. sherlocks02multi1080pblurayhdlightx265h4s5s work
Technical Evaluation and Viability Report FILE/RELEASE: Sherlock.S02.MULTi.1080p.BluRay.HDLight.x265-H4S5S TOPIC: Encoding Quality, Source Integrity, and Playback Performance For an "HDLight" release like this one, x265
: Older computers or budget media devices without native HEVC chips must rely on their central processor (CPU) to decode the video via software. This can result in high CPU usage, stuttering video frames, or desynced audio if the hardware is outdated. An uncompressed "remux" of that disc is a
"The x265 compression is efficient, Arthur, but your bit-depth is insulting. You’re losing the texture of the coat. And really, 1080p? In this economy of data, you should be striving for 4K or nothing at all."