A_27_ev.mp4

Often indicates the "A" channel, which usually refers to the front-facing camera in a multi-camera setup.

This is the most critical part of the filename. It signifies an Event or "Emergency" file. These are usually triggered automatically by a G-sensor (detecting a collision or sudden braking) or manually by the user pressing a "lock" button. mp4: The standard video file format. a_27_ev.mp4

Because this is marked as an "event" file, most dashcams will it, meaning it will not be overwritten by the normal loop recording cycle until you manually delete it or format the SD card. Often indicates the "A" channel, which usually refers

Typically represents the date (the 27th day of the month) or a sequential file number from that recording session. These are usually triggered automatically by a G-sensor

Does this file belong to a specific brand of camera, like a , Thinkware , or 70mai , that you need help troubleshooting?