This is a high-precision timestamp of when the recording started.
The filename "" follows a common automated naming convention used by many Android smartphones and camera apps to organize media chronologically. Breakdown of the Filename VID 20210312 105714340 mp4
The name is structured into three main components: a prefix, a date/time stamp, and a file extension. This is a high-precision timestamp of when the
This prefix stands for "Video," distinguishing it from image files (which usually start with IMG or PXL ). a date/time stamp
— Milliseconds or a unique sequential identifier to prevent name conflicts if multiple videos are taken in the same second.