38499-70 — 701531471561_sub_f_1532161730.mp4

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:

: 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" 38499-70 701531471561_Sub_f_1532161730.mp4

: Stands for Sub-stream . Security systems record in two modes: Main-stream : High resolution for playback and storage. The filename indicates it is likely a video