A_27_ev.mp4 -

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

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. a_27_ev.mp4

Typically represents the date (the 27th day of the month) or a sequential file number from that recording session. Often indicates the "A" channel, which usually refers