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DM8148 video motion artifacts

I posted the same problem on codec forum, but there are probably more people here.
I am using DM8148, IPNC-RDK3.2, when capturing 1080P@30fps, the video on HDMI looks fine, but saved h264 video has severe motion artifacts.

BTW: same artifacts are observed on MJPEG stream as well.

 when still 

by moving camera around, note the ghost behind the pole, and edge of the building

Please advise what parameters I need to look into