: Indicates that the video file includes subtitles . These may be "hard-coded" (burned into the video) or "soft-coded" (selectable in the player).
: This is likely a unique database ID or index number. In many digital archival systems, this number refers to a specific entry (e.g., Movie Magic Screenwriter uses similar codes for scenes). 13687-BR1080p-SUBS-OLDPEOPLE.mp4
Context Note: Interestingly, is also the number of a 2015 Executive Order concerning North Korean sanctions, though its appearance in a video filename is more likely a scene or catalog index. BR1080p : This indicates the source and quality. BR : Short for Blu-ray, the original physical source. 1080p : The resolution ( pixels), often called "Full HD." : Indicates that the video file includes subtitles