Samsung have 2 models (although hit by a ugly stick), both have dedicated lens/CCD's for DVC and DSC functions, DSC needs to be capable of controlling(and manually) aperture,ISO and shutter speeds to mimic a SLR camera.
A single lens unit is not capable of this, although the megapixel DVC create a acceptable still image, it would not compare to a cheap DSC camera, and a DSC does not produce a good video movie (maybe in time)
So carry 2, its always safer if one fails when on holiday
Capturing Stills from DVC Tape only good for web page thumbnail !
SD Capture fair to medium quality