: It could be a reference number for a video within a specific library or archive not indexed by general search engines.
: Many automated recording systems, security cameras, or software export tools generate alphanumeric strings like this (e.g., "Shin" might be a prefix for a specific device or user). Shin18982mp4
If this is a file you found or were asked to look up, checking the of the file or the original source where it was posted is the best way to identify its contents. : It could be a reference number for