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:

: Lower resolution, designed for remote viewing on mobile devices or multi-screen grids to save bandwidth. 38499-70 701531471561_Sub_f_1532161730.mp4

: Often signifies the recording type, such as "File" or "Full" (continuous recording). The filename indicates it is likely a video