: This indicates the source of the video. Subtitles for BluRay rips are timed to a specific frame rate (usually 23.976 fps). If you try to use these subtitles with a Web-DL or DVD rip, the text may gradually drift out of sync with the actors' voices.

: While this refers to the audio, it serves as a "fingerprint" for a specific release group’s encode (such as SPARKS or JYK). Release groups often have slightly different intro logos or "black screen" durations, so matching the subtitle to the specific audio/video metadata ensures perfect timing.

The specific filename you're looking for, , refers to a high-definition subtitle file (likely in .srt format) designed to sync with high-quality BluRay rips of Quentin Tarantino’s 2015 Western.