: This is likely an internal release number used by a specific group or a database ID.
In short, the file is a
: This means the video includes subtitles , which are likely hardcoded or included as a separate track within the file. 4712-BR720p-SUBS-KSANTHIESGOMENOI.mp4
This filename refers to a digital video file, most likely a movie or TV show episode, that has been shared online. Based on the naming conventions used in file-sharing communities, : This is likely an internal release number