SJ5000x, Loop Recording set to 3 Minutes, the files overlap for 1 second while on my SJ4000 the files line up exactly correct. This would appear to be a bug. I have since turned off loop recording to avoid the jump in the video every 3 minutes and the need to cut every video by 59 frames and overlap the two videos by 1 frame to prevent the audio from having a 1 frame dropout.
Figured out a workaround (1080p, 60 fps). On each 3 minute clip go to the end of the clip at 2:59:59 and cut. Delete the remaining portion of the clip. It will match up correctly with the next clip. I see that each 3 minute clip ends up being 3:01:01 long
