Pictures are great, video is terrible

The picture quality of this camera is excellent. I have to question other reviews that I read, wondering if they actually used the camera, or just chose to summarize the product literature. When taking videos, the sound quality is terrible. There is a sizzling sound that is always present. I have tried taking clips indoors and outdoors. With IS turned on or turned off. In a nearly silent setting, or with music playing. In all cases, the sizzling sound and scratchyness was present. For comparison, I recently took a few video clips with an SD550 at a wedding. The audio did not have any of these problems with that camera.