38499-70 — 701531471561_sub_f_1532161730.mp4

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

The primary feature of this file is that it is a of a security recording. Because it is a "Sub-stream" file, it will have a smaller file size and lower image quality compared to the primary recording, making it easier to share or upload. 38499-70 701531471561_Sub_f_1532161730.mp4

: Lower resolution, designed for remote viewing on mobile devices or multi-screen grids to save bandwidth. : A unique identification number, often the serial