: This file may use a professional codec (like H.265). VLC is the most reliable tool for opening varied security or stock formats.
: Likely refers to the bitrate (4000 kbps) or, less commonly in filenames, the color temperature (4000 Kelvin). 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. : This file may use a professional codec (like H
: 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. less commonly in filenames