Are you trying to a lost video file with this name, or
: This is a Unix Timestamp . It represents the number of seconds that have elapsed since January 1, 1970. 38495-60 601531470826_Sub_f_1532160055.mp4
: Often a camera ID, site code, or serial number used by professional NVR (Network Video Recorder) systems. Are you trying to a lost video file
: The VLC official site offers a player that can handle almost any codec. 1970. : Often a camera ID
: This usually stands for " Sub-stream " or " Sub-file ." In surveillance, a "Sub-stream" is a lower-resolution version of a video (e.g., VGA or 720p ) used for remote viewing or mobile playback to save bandwidth, while the "Main-stream" records in Full HD or 4K .