A_34_ev.mp4 -

: The .mp4 format is used to maintain high visual clarity of license plates and road signs while keeping the file size small enough for cloud uploading or SD card storage.

: Likely a timestamp or a sequential segment number within a larger recording session. a_34_ev.mp4

: Often refers to a specific camera angle (e.g., "front" or "repeater"). "front" or "repeater").