Changing Camera Settings
When you use the camera settings dialog to adjust the video size and frame rate (or frames per second / fps), Sparkbooth makes a request to the camera to best match your requested settings. The actual size and frame rate of the camera are displayed at the bottom of the video window. Your camera may not be able to match the requested settings so keep an eye on the size and frame rate after applying the settings.
If you cannot get the size or frame rate you want, try decreasing the size to get a higher frame rate or decreasing the frame rate to get a larger size.
Sparkbooth uses the Flash Player API to access the camera video so check for driver updates for your camera.