The string Ballet.Shoes.2007.1080p.BluRay.x264-[YTS] provides specific metadata for the video file the subtitles are intended for:
: Keep both the video and the subtitle file in the same folder. subtitle Ballet.Shoes.2007.1080p.BluRay.x264-[Y...
: This is the "release group." Subtitles must be timed specifically to the release group's edit, as different versions of a movie may have slightly different start times or frame rates. Finding and Using the Subtitles The string Ballet
This specific filename refers to a high-definition subtitle file for the 2007 film , specifically encoded to sync with the 1080p BluRay rip released by the "YTS" (formerly YIFY) group. About the Film subtitle Ballet.Shoes.2007.1080p.BluRay.x264-[Y...