38499-70 — 701531471561_sub_f_1532161730.mp4

: A unique identification number, often the serial number of the recorder or a specific event ID.

The filename indicates it is likely a video file recorded by a DVR or NVR security system (often associated with brands like Hikvision or Dahua ). Meaning of the Filename Parts: 38499-70 701531471561_Sub_f_1532161730.mp4

: Often signifies the recording type, such as "File" or "Full" (continuous recording). : A unique identification number, often the serial

: A Unix Timestamp . This number represents the exact second the video was recorded. Converted Time: Saturday, July 21, 2018, 08:28:50 AM (UTC) . Key "Feature" : A unique identification number