It looks like the cam has min 15 sec recordings, well, it is good for motion detection if some were triggered by flying inserts.
However, why I was in front of the cam and moving around but the cam sometimes will stop at 15 sec and sometimes seems no limit until I disappeared from the camera? Also, sometimes there were 2 recordings which the 2nd may start in few seconds later, which meant 2 similar but duplicated recordings.
My DCS-8630LH is 1.06.01