1080p_4000k_387288551.mp4 [REAL • HOW-TO]

: Likely refers to the bitrate (4000 kbps) or, less commonly in filenames, the color temperature (4000 Kelvin).

: This specific numeric naming is common when exporting clips from professional NVR (Network Video Recorder) software. If you found this on a drive, it is likely a recorded security event. 1080P_4000K_387288551.mp4

: Re-trace where the file was downloaded or exported from; the "guide" you need is likely specific to the software that generated this ID. : Likely refers to the bitrate (4000 kbps)