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.

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

: Lower resolution, designed for remote viewing on mobile devices or multi-screen grids to save bandwidth. : Stands for Sub-stream

: Often signifies the recording type, such as "File" or "Full" (continuous recording). 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.