: The resolution of the video. At 1920x1080 pixels, this is "Full HD".
: Indicates that the file includes subtitles . These are often "hardcoded" (burned into the image) or "muxed" (selectable) within the MP4 container. 13742-BR1080p-SUBS-UNDERWRAPS.mp4
: Short for Blu-ray . This tells the user that the source of the video was a high-quality physical disc rather than a television broadcast (HDTV) or a web stream (WebRip). : The resolution of the video
In the world of digital media, a file name acts as a detailed metadata tag. 13742-BR1080p-SUBS-UNDERWRAPS.mp4