701531471561_sub_f_1532161730.mp4: 38499-70

: Typically represents a system ID or a specific camera group code.

: Stands for Sub-stream . Security systems record in two modes: Main-stream : High resolution for playback and storage. 38499-70 701531471561_Sub_f_1532161730.mp4

: 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" : Typically represents a system ID or a

: A unique identification number, often the serial number of the recorder or a specific event ID. 38499-70 701531471561_Sub_f_1532161730.mp4

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.