It could be from a mismatched frame rate. What is the frame rate of the camera and what is the frame rate of the project and final render? If they are not the same, this could cause ghosting. The low quality may be from a low bitrate. Flowing water is one of the hardest things to represent at a low bitrate so that is definitely working against you. Try matching the frame rate and increasing the bitrate of the render.
~jr
http://www.johnrofrano.com
http://www.vasst.com