I am making a video for a social event from pictures and video. The start has stills zooming in and merging with text and sound dubbed over (ok so all of you have done this and much more but this is my first time). The start is only just over 1 min long and looks fine in the pc but when I try to write it back to the canonmv550i the picture drops out. I am thinking of helping the data transfer rate by adding the sound when the video is back in the camera. Will this help? Also I cant work out how to use the audio dub in the camera (I've lost the manual and only have the French/German/Italian copy which I dont understand) Can the audio dub copy sounds over an existing video?