38511-91 - 911531481498_sub_f_1532173254.mp4

: In technical or manufacturing contexts, "solid piece" usually refers to a component made from a single block of material (monolithic) rather than an assembly. Common Contexts for This Naming Style

Based on the structure of the filename, here is what can be inferred: 38511-91 911531481498_Sub_f_1532173254.mp4

Any or metadata associated with the "solid piece" mention? : In technical or manufacturing contexts, "solid piece"

: The string 1532173254 corresponds to a Unix timestamp for July 21, 2018 . : In technical or manufacturing contexts

: Automated CCTV exports often use long numerical strings and "Sub" (sub-stream) suffixes.