The file extension indicating it is an MPEG-4 Part 14 video container. This format is widely used because it provides high quality while keeping file sizes small through compression. Why This Format is Used Naming Files correctly with YYYYMMDD by Chris Menard
This is the date the video was recorded, following the ISO 8601 standard (YYYYMMDD). Year: 2021 Month: 03 (March) Day: 12 VID 20210312 105714340 mp4
— The hour, minute, and second (10:57 AM and 14 seconds). The file extension indicating it is an MPEG-4
— Milliseconds or a unique sequential identifier to prevent name conflicts if multiple videos are taken in the same second. a date/time stamp
The name is structured into three main components: a prefix, a date/time stamp, and a file extension.