About the setMode method of Camera

Quoted from here:

Sets the camera capture mode to the native mode that best meets the  specified requirements. If the camera does not have a native mode that  matches all the parameters you pass, Flash Player selects a capture mode  that most closely synthesizes the requested  mode. This manipulation may involve cropping the image and dropping  frames.

Does it mean that the frames captured is not necessarily the same as required by setMode(width:int, height:int, fps:Number, favorArea:Boolean = true) ? The actual frame captured may be either wider/narrower,higher/lower in size and have higher/lower frequency than required ,is this true?