Without knowing how the camera is mounted, and likely seeing some pics, it's hard to give anything other than very generic advice.
It looks like you're using some software to put the images together, add overlay, and possibly even resample the images. Have you looked at the raw images from the camera to verify the movement is in the camera and not in the post-process?
IPVMU Certified | 01/15/16 03:15am
Any minute thermal expansion or contraction can shift the FoV. Like Brian K mentions, it is hard to diagnose without a deeper look at the mounting surface, but any kind of freezing/thawing on the mount itself or even things like heaters or blowers warming the chassis up can be a source.
Also: is the ground itself moving? Snow loads accumulating on the pole/mount structure?
Fixing the issue is probably not difficult once the root cause is found.
It would appear after having viewed the video several times that the issue is electronic, not physical. You do have a minute shift of some articles, but one has to really look closely to see it. By the way, nice application and great view.
IMHO, this is not caused by camera motion, as Mark says.
If it WAS camera motion we would expect the effect to be greater in the foreground than the background. Instead it seems to be shifting across the frame irrespective of depth.
The integration of multi-exposure WDR frames is causing the shift.
That is if it has true WDR. :)
Otherwise maybe a H.264 Codec effect?
Thank you for you feedback. The camera is the Axis P1428-E (4K), WDR (not true) disabled.
For another location, same camera, same day, same application see http://nettkamera.cid.no/hortenfergehavn/2016-01-14/video/dayvideo.mp4. Same shifting problem.
And last, a Basler BIP-2500 camera with alu housing, same day, same application. Rock solid - no shifting. See http://nettkamera.cid.no/hortenhavn/2016-01-14/video/dayvideo.mp4.
Shifting seems connected to the P1428.
The timelapse video is created with ffmpeg using snapshots from the P1428. See http://nettkamera.cid.no/geilotimelapse/2016-01-14/original/2016-01-14-13-32-30.jpg and http://nettkamera.cid.no/geilotimelapse/2016-01-14/original/2016-01-14-13-34-30.jpg to see the shifts in the source stills/snapshots. Snapshots are downloaded using http://x.x.x.x/axis-cgi/jpg/image.cgi.