This specific file string refers to a high-definition rip of Game of Thrones Season 4
This specific Shaanig release typically features for all Dothraki, Valyrian, and other non-English dialogue segments. This means you do not need external subtitle files to understand the foreign language conversations—they are permanently burned into the video.
Unlike "HDTV" rips that originate from television broadcasts, the BluRay tag in this filename signifies the subtitles were ripped directly from the commercial Blu-ray disc.
Daenerys Targaryen struggles to maintain order in Meereen. Subtitle Information